Data Flow Diagrams (DFDs)

4 tahapan DFD“CurrentSystem”

“CurrentPhysical” DFDanalyze

“CurrentPhysical” DFD logically “Current

Logical” DFD

“CurrentLogical” DFD

design New “CurrentLogical” DFD

New “CurrentLogical” DFD

implementedNew “CurrentPhysical” DFD

1

2

3

4

4 elemen diagram

Process : “sesuatu” yg terjadi di sistem (berbicara dg teman tentang pesta)

Data flows : data yg berpindah ketika “sesuatu” terjadi (informasi pesta)

Data stores : data tersimpan yg dilibatkan ketika “sesuatu” terjadi (buku alamat, index kartu, file komputer)

External entities : segala sesuatu diluar sistem yg terlibat ketika “sesuatu” terjadi (teman, pelanggan, supplier)

Speak withprospective client

1 Sales Floor

Telephoneprospective client

2 Telesales

Mail prospectiveclient

3 Mailouts

A prospectiveclient

Product/ service info



M1

M1

M2

M3

Product catalogue

Product catalogue

Telephone directory

Prospective clients list



Telephone no.


Address

*

*

*

Process: Gambaran kejadian aktu

al dg keputusan yg ada Diberi no., pelaku/tempat

dicantumkan, & jelaskan kejadian prosesnya dg kt kerja perintah (telephone,calculate)

Proses dapat dibagi menjadi sub-proses 　 (level). *=akhir proses

No. proses <= 7, tinjau lg bila tidak.

External entities: Orang/tempat diluar s

istem, yg dilayani atau yg menyediakan

Direferensikan menurut abjad

Datastores: Menunjukan data dlm sistem Penjelasan & no.kode M=manual

files & D=computer data

Data flows: Aliran data dari/ke proses Diberi nama tanpa kt kerja Panah menunjukan arah aliran Data tdk dpt merubah, peruba

han terjadi di proses

Document flow diagram

ProductionPlanning

Factory

Stock Control

Supplier

Purchasing

Deliverynote

Productionplan

Stockwithdrawalnote

Purchaseorder

Supplier details update form

Delivery note

Material requirement list

Context diagram

ProductionPlanning

Supplier

Factory

PurchasingStock Control


Delivery note


Productionplan

Deliverynote

Stockwithdrawalnote

Level 0 Physical DFD

ProductionPlanning

Supplier

Factory

Purchasing


Delivery note


Productionplan

Deliverynote

Stockwithdrawalnote

Maintain stocksystem

Stock Control

a b

c

d

Level 0 Physical DFD-modified layout

ProductionPlanning

Supplier

Factory

Purchasing

Supplierdetails

update form

Materialrequirement list

Deliverynote

Stockwithdrawalnote


Stock Control

a

b

c

d

Productionplan

Deliverynote

Process leveling


Stock Control

Maintain stock card

2 Stock clerk

*

Prepare materialrequirements list

3 Stock clerk

Maintain plannedcall-off

1 Stock clerk

*

Calculate orderquantity

3.1 Stock clerk

*

Note supplier details

3.2 Stock clerk

*

Amend order quantity

3.3 Stock clerk

*

Add requirements tolist

3.4 Stock clerk

*

3Prepare materialrequirement list

Level 0 Level 1 Level 2


Maintain stock card

2 Stock clerk

*

Prepare materialrequirements list

3 Stock clerk

Maintain plannedcall-off

1 Stock clerk

*

ProductionPlanning

Supplier

Factory

Purchasing

Supplierdetails

update form

Materialrequirement list

Deliverynote

Stockwithdrawalnote

a

b

c

d

Productionplan

Deliverynote

M1 Bill of materials

M2 Stock cards

Stockdetails

Stockdetails

Plan call-offdetails

BOMdetails


Calculate orderquantity

3.1 Stock clerk

*

Note supplier details

3.2 Stock clerk

*

Amend order quantity

3.3 Stock clerk

*

Add requirements tolist

3.4 Stock clerk

*

3Prepare materialrequirement list

M2 Stock cardsStockdetails

Theoretical order quantity

Order quantity & supplier details

Actual order quantity

Purchasing

dMaterialrequirement list

Menentukan Proses

Tujuan : menjelaskan proses yg terjadi pada level tera

khir DFD Menuliskan keputusan yg dibuat atau operasi

yg berulang secara akurat, jelas, dan lengkap.

Contoh

1. A product is passed as fit for sale if it passes a mechanical test and an electrical test and has the correct dimensions. If it fails the mechanical test or the electrical test (but not both), it is sent back to the workshop for repair. In all other cases, the product is rejected.

2. A product is passed as fit for sale if it passes a mechanical test and an electrical test and has the correct dimensions. If it has the correct dimensions and fails the mechanical test or the electrical test (but not both), it is sent back to the workshop for repair. In all other cases, the product is rejected.

Sequence (urutan)adalah list dari beberapa tindakan atau kejadian yang dilakukan atas dasar perintah. Diwakilkan dg pernyataan perintahContoh : multiply(kalikan), add(tambahkan), or calculate(hitung)

Selection (pilihan/keputusan)bila ada beberapa pilihan kebijakan yg dapat digunakan tapi hanya ada satu yg bisa dipilih.Contoh : IF, ELSE, ENDIF

Iterationmuncul ketika beberapa kejadian berulang menentukan kondisi yang berkelanjutan pengulangannyaContoh : REPEAT….UNTIL, WHILE….ENDWHILE

Variations

Contoh (deskripsi QC policy) :1. If a product does not have the correct dimensions, rej

ect the product2. If a product does have the correct dimensions, consid

er the mechanical and electrical test as follows2.1 both test satisfactory-pass product2.2 both mechanical and electrical test unsatisfactory-reject product2.3 either mechanical or electrical tests unsatisfactory (but not both)-repair product.

Decision tables

Condition stub Condition entry

Action stub Action entry

Decision table (Limited entry)

Contoh : Identify conditions

correct dimension?passed mechanical test?passed electrical test?

Identify actionaccept productrepair productreject product

Determine number of rules 2 (pangkat) NN = number of condition = 8

Decision table

Correct dimensions ? Y Y Y Y N N N N

Passed mech. test ? Y Y N N Y Y N N

Passed elect. test ? Y N Y N Y N Y N

Accept product X

Repair product X X

Reject product X X X X X

Decision table

Correct dimensions ? Y Y Y Y N

Passed mech. test ? Y Y N N -

Passed elect. test ? Y N Y N -

Accept product X

Repair product X X

Reject product X X

Decision table

Correct dimensions ? Y Y Y E

Passed mech. test ? Y Y N L

Passed elect. test ? Y N Y S

E

Accept product X

Repair product X X

Reject product X

Decision table (Extended entry)

Mark 0-34? Y N N N N N

Mark 35-39? - Y N N N N

Mark 40-49? - - Y N N N

Mark 50-59? - - - Y N N

Mark 60-69? - - - - Y N

Mark>69? - - - - - Y

Grade F X

Grade E X

Grade D X

Grade C X

Grade B X

Grade A X

Decision table (Extended entry)

Mark 0-34 35-39 40-49 50-59 60-69 >69

Grade F E D C B A

Decision table (Mixed entry)

Regular customer? Y Y Y N N N

Order value $ 0-99 100-500 >500 0-99 100-500 >500

Discount given 0 15% 20% 0 10% 15%

Free gift X X

Data Flow Diagrams (DFDs)

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