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Scheduling CTC-470. Short Interval Scheduling Plan & manage day to day activities Focus on individual activities Goal Oriented to get activity done Two.

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Presentation on theme: "Scheduling CTC-470. Short Interval Scheduling Plan & manage day to day activities Focus on individual activities Goal Oriented to get activity done Two."— Presentation transcript:

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


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