Scheduling

CTC-415

Scheduling

• Putting the activities in chronological order– Chicken or the egg

• Allows the PM to determine the time required to complete a project

Types of Schedules

• Depend on Viewer– Simple bar chart (Gantt chart)

• Tells owner progress

– Activity on Node (AON)– Activity on Arrow (AOA)

• Used by PM, supers, foremen

Developing Activity Sequence

• Physical Relationship• An activity cannot start until a previous one is complete

• Safety Relationship• Performing activities which cause a safety hazard to other

activities

• Resource Relationship• The amount of resources available at any time

• Preferential Relationship• Contractors preference on activity order

Constructing Bar Chart

• How should bar chart be laid out– Time on horizontal axis– Activity on vertical axis– Time of activity start based on position– Duration of activity based on length of line

• Day = start of day to start of day

Constructing Bar Chart

• What time unit should be used– Work days– Hours– Weeks– Bar chart size may dictate time units

Constructing Bar Chart

• Additional Info– Activity Value– Activity Cost– Activity Resource requirements

Constructing Bar Chart

• Work days or Calendar days– Work days harder to follow

• No weekends or holidays

– Calendar days allow you to see concrete curing

Gantt Chart

• Looks like a horizontal bar chart

• Good for linear work

• Good for providing an overview of the project

• Not good for complex projects

Gantt Chart

ID Task Name Duration

1 Excavate foundation 2d

2 Form footings 1d

3 Pour footings 2d

4 strip footings 1d

5 Form foundation walls 1d

6 Pour foundation walls 3d

7 Strip forms 1d

8 Frame 1st floor 2d

9 Backfill foundation 1d

10 Frame 1st floor walls 2d

11 Frame 2nd floor 2d

12 Frame 2 floor walls 2d

13 Frame 2nd floor ceiling 1d

14 Frame roof 3d

15 Shingle roofing 4d

16 Rough plumbing 3d

17 Rough electric 3d

18 Insulation 2d

19 Drywall 3d

20

21

22

23

24

F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S S M T WApr 7, '02 Apr 14, '02 Apr 21, '02 Apr 28, '02 May 5, '02 May 12