1. Scheduling
CTC-470

2. Short Interval Scheduling
Plan & manage day to day activities
Focus on individual activities
Goal Oriented to get activity done
Two Categories
Look Ahead
Production

3. Look Ahead Scheduling
Focuses on what needs to be accomplished during next time period
Extract from overall schedule
More detailed than overall schedule since looking at day to day activities
Must make sure that look ahead schedule matches the overall schedule

4. Production Scheduling
Plan and Schedule one specific activity or group of sub activities related to a particular construction process
Good for subcontractor work
Types of schedules
Date list, Bar Chart, Network Schedule
Graphic Schedule, Matrix Schedule, Velocity Diagram

5. Production Scheduling
Date List
List of Dates used to plan and manage an activity
Difficult to follow without a narrative
Figure 9-2
Bar Chart
Like a regular bar chart but for sub activities
Figure 9-3

6. Production Scheduling
Network Schedule
More complicated
More info
Figure 9-4
Graphic Schedule
Easy to read
Figure 9-5

7. Production Scheduling
Matrix Schedule
Good when identical activities with very similar sub-activities
When work is repetitive
Figure 9-6
Velocity Diagrams
Relationship between time and output
Very effective, easy to read
Figure 9-7

8. Precedence Diagram Method
Extension of AON Network
Allows concurrent activities to overlap
Restraints not required to model logical relationships
Schedule logic is easier and quicker to develop
Easier to modify
Better represents work flow in continuous operations

9. Precedence Diagram Method
Disadvantages
Need to use finish to start relationships
Harder to update and manage due to reduced network detail

10. Precedence Diagram Method
Activity Lead – Lag
Lag = time that a following activity is delayed from the start of the previous activity
Lead = time that an activity precedes the start or finish of the next activity

11. Precedence Diagram Method
PDM Relationships
Finish to Start
Like AON when no lag
Start to Start
Gives a time between the current activity start and when next activity can start
Finish to Finish
Gives a time between the current activity finish and when next activity can finish

12. Precedence Diagram Method
Calculation Assumption
Once work starts it runs until complete
Activities are scheduled based on their duration
Work is not interrupted or stretched

13. Precedence Diagram Method
Controlling Relationships
Forward pass
Relationship that results in latest early finish time
Backwards pass
Relationship that results in earliest late start time

14. Precedence Diagram Method
Forward pass
Calculates the earliest time each activity in network can start and finish
Minimum project duration
Backwards pass
Calculate the latest time an activity can start and finish