Precedence Tables

National 5 Lifeskills Mathematics Geometry and Measures

Getting ready to go for an interview?

National 5 Lifeskills Mathematics Geometry and Measures

National 5 Lifeskills Mathematics Geometry and Measures

Check train/bus timetable

Choose clothes to wear

Iron clothes

Shower and wash hair

Get dressed

Travel to interview

It might involve some of these steps…

Dry hair

National 5 Lifeskills Mathematics Geometry and Measures

But do some steps need to be carried out before others?

We need to…

Before we… Dry hair

Shower and wash hair

National 5 Lifeskills Mathematics Geometry and Measures

The order of some steps can be changed but there are some that take precedence over others (i.e. they must be done before others).

We can show this in a precedence table like this:

Task Description Before tasks After tasks Expected time

A

B

C

D

..

Dependencies

National 5 Lifeskills Mathematics Geometry and Measures

We can put the steps in an order… Choose clothes to wear

Dry hair

Get dressed

Iron clothes

Travel to interview

Check train/bus timetable

Shower and wash hair

National 5 Lifeskills Mathematics Geometry and Measures

Task Description Before tasks

After tasks

Expected time (minutes)

A Choose clothes to wear B 5

B Iron clothes A E, G 10

C Shower and wash hair D, E, G 15

D Dry hair C E, G 20

E Get dressed A,B, C F, G 15

F Check train/bus timetable G 5

G Travel to interview A, B, C, D,E, F 30

National 5 Lifeskills Mathematics Geometry and Measures

Organising an inter-school badminton competition

Compile a list of entrants from replies

Organise catering arrangements

Invite participants and ask for replies

Order shuttlecocks and trophies

Locate and book officials for matches

Book a sports hall

Plan competition matches

National 5 Lifeskills Mathematics Geometry and Measures

Compile a list of entrants from replies

Organise catering arrangements

Invite participants and ask for replies

Order shuttlecocks and trophies

Locate and book officials for matches

Put tasks in an orderBook a sports hall

Plan competition matches

National 5 Lifeskills Mathematics Geometry and Measures

Draw precedence tableTask Description Before tasks After

tasksExpected time

(hours)

A Book a sports hall B, C, D 1

B Locate and book officials for matches F, G 2

C Invite participants and ask for replies A D, G 1

D Compile a list of entrants from replies A, C E, F, G 1

E Order shuttlecocks and trophies A, C, D 2

F Plan competition matches A, B, C, D G 5

G Organise catering arrangements A, B, C, D, 2