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To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved. Scheduling Scheduling Chapter 17 Chapter 17
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Transcript of Ch17
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SchedulingScheduling
Chapter 17Chapter 17
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Gantt ChartsGantt ChartsProgress ChartProgress Chart
Plymouth
Ford
Pontiac
Job 4/20 4/22 4/23 4/24 4/25 4/264/214/17 4/18 4/19
Figure 17.1Figure 17.1
Key
Start activity
Finish activity
Scheduled activity time
Actual progress
Nonproductive time
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Plymouth
Ford
Pontiac
Job 4/20 4/22 4/23 4/24 4/25 4/264/214/17 4/18 4/19
Gantt ChartsGantt ChartsProgress ChartProgress ChartFigure 17.1Figure 17.1 Current Current
date date
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Gantt ChartsGantt ChartsFigure 17.2Figure 17.2
Operating Rooms ChartOperating Rooms Chart
Operating Room A
Workstation 7am
Operating Room B
Operating Room C
12 noon8am 9am 10am 11am 1pm 2pm 3pm 4pm 5pm 6pm
TimeTime
Dr. Jon Adams Dr. Aubrey Brothers
Dr. Gary CaseDr. Jeff
Dow Dr. Madeline Easton
Dr. Dan GillespieDr. Jordanne Flowers
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22EmployeeEmployee 22 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22EmployeeEmployee 22 XX XX XX XX XX
RequirementRequirement 44 22 66 77 8*8* 33 22
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22EmployeeEmployee 22 XX XX XX XX XX
RequirementRequirement 44 22 66 77 8*8* 33 22EmployeeEmployee 33 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22EmployeeEmployee 22 XX XX XX XX XX
RequirementRequirement 44 22 66 77 8*8* 33 22EmployeeEmployee 33 XX XX XX XX XX
RequirementRequirement 33 11 55 66 7*7* 33 22
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22EmployeeEmployee 22 XX XX XX XX XX
RequirementRequirement 44 22 66 77 8*8* 33 22EmployeeEmployee 33 XX XX XX XX XX
RequirementRequirement 33 11 55 66 7*7* 33 22EmployeeEmployee 44 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22EmployeeEmployee 22 XX XX XX XX XX
RequirementRequirement 44 22 66 77 8*8* 33 22EmployeeEmployee 33 XX XX XX XX XX
RequirementRequirement 33 11 55 66 7*7* 33 22EmployeeEmployee 44 XX XX XX XX XX
RequirementRequirement 33 11 44 55 6*6* 22 11
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
Number of employeesNumber of employees 66 44 88 99 10*10* 33 22EmployeeEmployee 11 XX XX XX XX XX
RequirementRequirement 55 33 77 88 9*9* 33 22EmployeeEmployee 22 XX XX XX XX XX
RequirementRequirement 44 22 66 77 8*8* 33 22EmployeeEmployee 33 XX XX XX XX XX
RequirementRequirement 33 11 55 66 7*7* 33 22EmployeeEmployee 44 XX XX XX XX XX
RequirementRequirement 33 11 44 55 6*6* 22 11EmployeeEmployee 55 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
RequirementRequirement 22 00 33 44 5*5* 22 11
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
RequirementRequirement 22 00 33 44 5*5* 22 11EmployeeEmployee 66 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
RequirementRequirement 22 00 33 44 5*5* 22 11EmployeeEmployee 66 XX XX XX XX XX
RequirementRequirement 22 00 22 33 4*4* 11 00EmployeeEmployee 77 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
RequirementRequirement 22 00 33 44 5*5* 22 11EmployeeEmployee 66 XX XX XX XX XX
RequirementRequirement 22 00 22 33 4*4* 11 00EmployeeEmployee 77 XX XX XX XX XX
RequirementRequirement 11 00 11 22 3*3* 11 00EmployeeEmployee 88 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
RequirementRequirement 22 00 33 44 5*5* 22 11EmployeeEmployee 66 XX XX XX XX XX
RequirementRequirement 22 00 22 33 4*4* 11 00EmployeeEmployee 77 XX XX XX XX XX
RequirementRequirement 11 00 11 22 3*3* 11 00EmployeeEmployee 88 XX XX XX XX XX
RequirementRequirement 00 00 00 11 2*2* 11 00EmployeeEmployee 99 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
RequirementRequirement 22 00 33 44 5*5* 22 11EmployeeEmployee 66 XX XX XX XX XX
RequirementRequirement 22 00 22 33 4*4* 11 00EmployeeEmployee 77 XX XX XX XX XX
RequirementRequirement 11 00 11 22 3*3* 11 00EmployeeEmployee 88 XX XX XX XX XX
RequirementRequirement 00 00 00 11 2*2* 11 00EmployeeEmployee 99 XX XX XX XX XX
RequirementRequirement 00 00 00 00 1*1* 00 00EmployeeEmployee 1010 XX XX XX XX XX
Required employeesRequired employeesExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
EmployeeEmployee 11 XX XX XX XX XX offoff offoff
EmployeeEmployee 22 XX XX XX XX XX offoff offoff
EmployeeEmployee 33 XX XX XX XX XX offoff offoff
EmployeeEmployee 44 offoff offoff XX XX XX XX XXEmployeeEmployee 55 XX XX XX XX XX offoff offoff
EmployeeEmployee 66 offoff offoff XX XX XX XX XXEmployeeEmployee 77 XX XX XX XX XX offoff offoff
EmployeeEmployee 88 XX XX XX XX XX offoff offoff
EmployeeEmployee 99 offoff XX XX XX XX XX offoff
EmployeeEmployee 1010 XX XX XX XX XX offoff offoff
Final ScheduleFinal ScheduleExample 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
EmployeeEmployee 11 XX XX XX XX XX offoff offoff
EmployeeEmployee 22 XX XX XX XX XX offoff offoff
EmployeeEmployee 33 XX XX XX XX XX offoff offoff
EmployeeEmployee 44 offoff offoff XX XX XX XX XXEmployeeEmployee 55 XX XX XX XX XX offoff offoff
EmployeeEmployee 66 offoff offoff XX XX XX XX XXEmployeeEmployee 77 XX XX XX XX XX offoff offoff
EmployeeEmployee 88 XX XX XX XX XX offoff offoff
EmployeeEmployee 99 offoff XX XX XX XX XX offoff
EmployeeEmployee 1010 XX XX XX XX XX offoff offoff
Final ScheduleFinal ScheduleExample 17.1Example 17.1
Day M T W Th F S Su TOTAL
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
EmployeeEmployee 11 XX XX XX XX XX offoff offoff
EmployeeEmployee 22 XX XX XX XX XX offoff offoff
EmployeeEmployee 33 XX XX XX XX XX offoff offoff
EmployeeEmployee 44 offoff offoff XX XX XX XX XXEmployeeEmployee 55 XX XX XX XX XX offoff offoff
EmployeeEmployee 66 offoff offoff XX XX XX XX XXEmployeeEmployee 77 XX XX XX XX XX offoff offoff
EmployeeEmployee 88 XX XX XX XX XX offoff offoff
EmployeeEmployee 99 offoff XX XX XX XX XX offoff
EmployeeEmployee 1010 XX XX XX XX XX offoff offoff
Final ScheduleFinal ScheduleExample 17.1Example 17.1
Day M T W Th F S Su TOTAL
Capacity, C 7 8 10 10 10 3 2 50
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
EmployeeEmployee 11 XX XX XX XX XX offoff offoff
EmployeeEmployee 22 XX XX XX XX XX offoff offoff
EmployeeEmployee 33 XX XX XX XX XX offoff offoff
EmployeeEmployee 44 offoff offoff XX XX XX XX XXEmployeeEmployee 55 XX XX XX XX XX offoff offoff
EmployeeEmployee 66 offoff offoff XX XX XX XX XXEmployeeEmployee 77 XX XX XX XX XX offoff offoff
EmployeeEmployee 88 XX XX XX XX XX offoff offoff
EmployeeEmployee 99 offoff XX XX XX XX XX offoff
EmployeeEmployee 1010 XX XX XX XX XX offoff offoff
Final ScheduleFinal ScheduleExample 17.1Example 17.1
Day M T W Th F S Su TOTAL
Capacity, C 7 8 10 10 10 3 2 50Requirements, R 6 4 8 9 10 3 2 42
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Scheduling ServicesScheduling Services
DayDay MM TT WW ThTh FF SS SuSu
EmployeeEmployee 11 XX XX XX XX XX offoff offoff
EmployeeEmployee 22 XX XX XX XX XX offoff offoff
EmployeeEmployee 33 XX XX XX XX XX offoff offoff
EmployeeEmployee 44 offoff offoff XX XX XX XX XXEmployeeEmployee 55 XX XX XX XX XX offoff offoff
EmployeeEmployee 66 offoff offoff XX XX XX XX XXEmployeeEmployee 77 XX XX XX XX XX offoff offoff
EmployeeEmployee 88 XX XX XX XX XX offoff offoff
EmployeeEmployee 99 offoff XX XX XX XX XX offoff
EmployeeEmployee 1010 XX XX XX XX XX offoff offoff
Final ScheduleFinal Schedule
Day M T W Th F S Su TOTAL
Capacity, C 7 8 10 10 10 3 2 50Requirements, R 6 4 8 9 10 3 2 42Slack, C – R 1 4 2 1 0 0 0 8
Example 17.1Example 17.1
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Sh
ipp
ing
Dep
art
men
tS
hip
pin
g D
epa
rtm
ent
Manufacturing ProcessManufacturing Process
Figure 17.3Figure 17.3
Raw
Ma
teri
als
Raw
Ma
teri
als
Legend:Legend:
Batch of partsBatch of parts
WorkstationWorkstation
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Dispatching ProceduresDispatching Procedures
Critical ratio Critical ratio (CR)(CR)= (Due date – Today’s date)/Total shop time remaining= (Due date – Today’s date)/Total shop time remaining
Earliest due dateEarliest due date (EDD) (EDD) First come, first served (FCFS)First come, first served (FCFS) Shortest processing time Shortest processing time (SPT)(SPT) Slack per remaining operationsSlack per remaining operations (S/RO) (S/RO)
= ((Due date - Today’s date) – Total shop time remaining)/= ((Due date - Today’s date) – Total shop time remaining)/
Number of operations remainingNumber of operations remaining
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules – – EDDEDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time =Average job flow time =8 + 14 + 17 + 32 + 448 + 14 + 17 + 32 + 44
55
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Average hours early = Average hours early =
2 + 0 + 1 + 0 + 02 + 0 + 1 + 0 + 0
55
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Average hours early = 0.6 hourAverage hours early = 0.6 hour
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Average hours early = 0.6 hourAverage hours early = 0.6 hour
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = Average hours past due = 0 + 2 + 0 + 12 + 220 + 2 + 0 + 12 + 22
55
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Average hours early = 0.6 hourAverage hours early = 0.6 hour
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = 7.2 hoursAverage hours past due = 7.2 hours
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Average hours early = 0.6 hourAverage hours early = 0.6 hour
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = 7.2 hoursAverage hours past due = 7.2 hours Average WIP = Average WIP = Sum of flow timesSum of flow times
MakespanMakespan
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Average hours early = 0.6 hourAverage hours early = 0.6 hour
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = 7.2 hoursAverage hours past due = 7.2 hours Average WIP = Average WIP = 8 + 14 + 17 + 32 + 448 + 14 + 17 + 32 + 44
4444
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Average hours early = 0.6 hourAverage hours early = 0.6 hour
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
Example 17.2Example 17.2
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = 7.2 hoursAverage hours past due = 7.2 hours Average WIP = 2.61 blocksAverage WIP = 2.61 blocks
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
Example 17.2Example 17.2
Average hours early = 0.6 hourAverage hours early = 0.6 hour
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = 7.2 hoursAverage hours past due = 7.2 hours Average WIP = 2.61 blocksAverage WIP = 2.61 blocks
Average total inventory =Average total inventory =Sum of time in systemSum of time in system
MakespanMakespan
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
Example 17.2Example 17.2
Average hours early = 0.6 hourAverage hours early = 0.6 hour
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = 7.2 hoursAverage hours past due = 7.2 hours Average WIP = 2.61 blocksAverage WIP = 2.61 blocks
Average total inventory =Average total inventory =10 + 14 + 18 + 32 + 4410 + 14 + 18 + 32 + 44
4444
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– EDD EDD
Example 17.2Example 17.2
Average hours early = 0.6 hourAverage hours early = 0.6 hour
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
RangerRanger 88 1010ExplorerExplorer 66 1212Econoline 150Econoline 150 33 1818BroncoBronco 1515 2020ThunderbirdThunderbird 1212 2222
00 ++ == 88 1010 22
1717 ++ == 3232 3232 1212
88 ++ == 1414 1414 221414 ++ == 1717 1818 11
3232 ++ == 4444 4444 2222
Average job flow time = 32 hoursAverage job flow time = 32 hours
Average hours past due = 7.2 hoursAverage hours past due = 7.2 hours Average WIP = 2.61 blocksAverage WIP = 2.61 blocks
Average total inventory = 2.68 engine blocksAverage total inventory = 2.68 engine blocks
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SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– SPT SPT
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
Econoline 150Econoline 150 0 0 ++ 33 == 3 3 1818 1818 1515ExplorerExplorer 33 ++ 66 == 99 1212 1212 33RangerRanger 66 ++ 88 == 1717 1010 1717 77ThunderbirdThunderbird 1717 ++ 1212 == 2929 2222 2929 77BroncoBronco 2929 ++ 1515 == 4444 2020 4444 2424
Average job flow time = 20.4 hoursAverage job flow time = 20.4 hours Average hours early = 3.6 hourAverage hours early = 3.6 hour
Average hours past due = 7.6 hoursAverage hours past due = 7.6 hours Average WIP = 2.32 blocksAverage WIP = 2.32 blocks
Average total inventory = 2.73 engine blocksAverage total inventory = 2.73 engine blocks
Example 17.2Example 17.2
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SequencingSequencingSingle-Dimension Rules Single-Dimension Rules –– SPT SPT
JobJob ScheduledScheduled ActualActualEngineEngine ProcessingProcessing FlowFlow CustomerCustomer CustomerCustomer HoursHoursBlockBlock BeginBegin TimeTime TimeTime PickupPickup PickupPickup HoursHours PastPast
SequenceSequence WorkWork (hr)(hr) (hr)(hr) TimeTime TimeTime EarlyEarly DueDue
Econoline 150Econoline 150 0 0 ++ 33 == 3 3 1818 1818 1515ExplorerExplorer 33 ++ 66 == 99 1212 1212 33RangerRanger 66 ++ 88 == 1717 1010 1717 77ThunderbirdThunderbird 1717 ++ 1212 == 2929 2222 2929 77BroncoBronco 2929 ++ 1515 == 4444 2020 4444 2424
Average job flow time = 20.4 hoursAverage job flow time = 20.4 hours Average hours early = 3.6 hourAverage hours early = 3.6 hour
Average hours past due = 7.6 hoursAverage hours past due = 7.6 hours Average WIP = 2.32 blocksAverage WIP = 2.32 blocks
Average total inventory = 2.73 engine blocksAverage total inventory = 2.73 engine blocks
Example 17.2Example 17.2
Rule Comparison
EDD SPT
Average job flow time 23.00 20.40Average hours early 0.60 3.60Average hours past due 7.20 7.60Average WIP 2.61 2.32Average total inventory 2.68 2.73
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.122 10.510.5 1010 22 7.87.833 6.26.2 2020 1212 14.514.544 15.615.6 88 55 10.210.2
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR = CR = Time remaining to due dateTime remaining to due date
Shop time remainingShop time remaining
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.122 10.510.5 1010 22 7.87.833 6.26.2 2020 1212 14.514.544 15.615.6 88 55 10.210.2
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR = CR = 1515
6.16.1
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.122 10.510.5 1010 22 7.87.833 6.26.2 2020 1212 14.514.544 15.615.6 88 55 10.210.2
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR = = 2.46CR = = 2.461515
6.16.1
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.4622 10.510.5 1010 22 7.87.833 6.26.2 2020 1212 14.514.544 15.615.6 88 55 10.210.2
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR = = 2.46CR = = 2.461515
6.16.1
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.4622 10.510.5 1010 22 7.87.8 1.281.2833 6.26.2 2020 1212 14.514.5 1.381.3844 15.615.6 88 55 10.210.2 .78.78
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.4622 10.510.5 1010 22 7.87.8 1.281.2833 6.26.2 2020 1212 14.514.5 1.381.3844 15.615.6 88 55 10.210.2 .78.78
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
S/RO = S/RO = Time remaining to due date – Shop time remainingTime remaining to due date – Shop time remaining
Number of operations remainingNumber of operations remaining
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.4622 10.510.5 1010 22 7.87.8 1.281.2833 6.26.2 2020 1212 14.514.5 1.381.3844 15.615.6 88 55 10.210.2 .78.78
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
S/RO = S/RO = 15 – 6.115 – 6.1
1010
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.4622 10.510.5 1010 22 7.87.8 1.281.2833 6.26.2 2020 1212 14.514.5 1.381.3844 15.615.6 88 55 10.210.2 .78.78
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
S/RO = = 0.89S/RO = = 0.8915 – 6.115 – 6.1
1010
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.2833 6.26.2 2020 1212 14.514.5 1.381.3844 15.615.6 88 55 10.210.2 .78.78
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
S/RO = = 0.89S/RO = = 0.8915 – 6.115 – 6.1
1010
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence ==CR Sequence =
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4= 4CR Sequence =
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2– 2CR Sequence =
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3– 2 – 3CR Sequence =
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1CR Sequence =
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence ==CR SequenceCR Sequence ==
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4= 4CR SequenceCR Sequence ==
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 3 CR SequenceCR Sequence ==
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 1 – 3 – 1 CR SequenceCR Sequence ==
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 1 – 2– 3 – 1 – 2CR SequenceCR Sequence ==
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 1 – 2– 3 – 1 – 2CR SequenceCR Sequence ==
Sequence Summary
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 1 – 2– 3 – 1 – 2CR SequenceCR Sequence ==
Sequence Summary
FCFS = 1 – 2 – 3 – 4
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 1 – 2– 3 – 1 – 2CR SequenceCR Sequence ==
Sequence Summary
FCFS = 1 – 2 – 3 – 4SPT = 1 – 3 – 2 – 4
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 1 – 2– 3 – 1 – 2CR SequenceCR Sequence ==
Sequence Summary
FCFS = 1 – 2 – 3 – 4SPT = 1 – 3 – 2 – 4EDD = 4 – 2 – 1 – 3
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SequencingSequencingMultiple-Dimension RulesMultiple-Dimension Rules
11 2.32.3 1515 1010 6.16.1 2.462.46 0.890.8922 10.510.5 1010 22 7.87.8 1.281.28 1.101.1033 6.26.2 2020 1212 14.514.5 1.381.38 0.460.4644 15.615.6 88 55 10.210.2 .78.78 – 0.44– 0.44
OperationOperation TimeTimeTime atTime at RemainingRemaining Number ofNumber ofEngineEngine to Due Dateto Due Date OperationsOperations Shop TimeShop Time
JobJob Lathe (hr)Lathe (hr) (Days)(Days) RemainingRemaining RemainingRemaining CRCR S/ROS/RO
Example 17.3Example 17.3
CR SequenceCR Sequence = 4 = 4 – 2 – 3 – 1– 2 – 3 – 1S/RO SequenceS/RO Sequence = 4 = 4 – 3 – 1 – 2– 3 – 1 – 2CR SequenceCR Sequence ==
Sequence Summary
FCFS = 1 – 2 – 3 – 4SPT = 1 – 3 – 2 – 4EDD = 4 – 2 – 1 – 3
Avg Flow Time 17.175 16.100 26.175 27.150 24.025Avg Early Time 3.425 6.050 0 0 0Avg Past Due 7.350 8.900 12.925 13.900 10.775Avg WIP 1.986 1.861 3.026 3.129 2.777Avg Total Inv 2.382 2.561 3.026 3.129 2.777
Shortest Slack perProcessing Earliest Critical Remaining
FCFS Time Due Date Ratio Operation
Priority Rule Summary
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SequencingSequencingSimulationSimulation
Example 17.4Example 17.4
PRECISION AUTOBODY PROCESS TIMESPRECISION AUTOBODY PROCESS TIMES
TIME TO PERFORMTIME TO PERFORM
1.1. Frame straightening *Frame straightening * 88 222a.2a. Body repair, major damage *Body repair, major damage * 1616 442b.2b. Body repair, minor damage *Body repair, minor damage * 88 22
3.3. Paint preparationPaint preparation 1111//4411//33
4.4. Paint application (two coats)Paint application (two coats) 1111//2211//22
6.6. Clean upClean up 33 11//22
OPERATIONOPERATION Average (hr)Average (hr) Standard DeviationStandard Deviation
* Not necessary for all vehicles* Not necessary for all vehicles
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SequencingSequencingSimulationSimulation
Figure 17.4Figure 17.4
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SequencingSequencingSimulationSimulation
Figure 17.5Figure 17.5
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SequencingSequencingSimulationSimulation
Figure 17.6Figure 17.6
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SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Example 17.5Example 17.5
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SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Example 17.5Example 17.5
Sequence = Sequence =
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SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence =
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M3M3
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M3M3
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M3M3
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M3M3
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M2M2 M3M3
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M2M2 M3M3
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M2M2 M3M3
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M2M2 M3M3M5M5 --
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M2M2 M3M3M5M5 --
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M5M5 ----
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M5M5 ----
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
2
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
2
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
2
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5)
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5)
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5) Idle
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5)
M1 (22)Idle
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5)
M1 (22)
M4 (16)Idle
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5)
M1 (22)
M4 (16)
M5 (8)Idle
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5)
M1 (22)
M4 (16)
M5 (8)
M3 (3)Idle
1
Example 17.5Example 17.5
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
SequencingSequencingJohnson’s RuleJohnson’s Rule
Time (hr)Time (hr)
MotorMotor Workstation 1Workstation 1 Workstation 2Workstation 2
M1M1 1212 2222M2M2 44 55M3M3 55 33M4M4 1515 1616M5M5 1010 88
Sequence = Sequence = M1M1M2M2 M3M3M4M4 M5M5 ---- -- --
Workstation
M2 (4)
M1 (12)
M4 (15)
M5 (10)
M3 (5)
Idle—available for further work
0 5 10 15 20 25 30Day
35 40 45 50 55 60 65
Idle2 M2 (5)
M1 (22)
M4 (16)
M5 (8)
M3 (3)Idle
1
Figure 17.7Figure 17.7
To Accompany Krajewski & Ritzman Operations Management: Strategy and Analysis, Seventh Edition © 2004 Prentice Hall, Inc. All rights reserved.
Solved Problem 4Solved Problem 4
Figure 17.8Figure 17.8
Dredge E H G F B J I C D A
Incinerate E H G F B J I C D A
Storage basinStorage basin
