Flashcards
Scheduling Techniques
Cards in this deck (18)
- 1What are the key steps in creating a schedule?1. Work breakdown structure (WBS) generated.
2. Precedence diagram produced from WBS.
3. Gantt chart derived from precedence diagram.
4. Resource histogram made from Gantt chart.
5. Profiled resource curve transformed into project budget - 2How is a precedence diagram created?Using precedence diagram method.
Lowest levels of work package placed in logical sequence.
Sequence progresses from left to right based on task dependency.
Work package now becomes a node.
Lines between nodes indicate relationship. - 3What type of node relationships are there?Finish to Start - subsequent node cannot begin until preceding node completed.
Start to Start - Work on a node cannot begin until work on another node has begun.
Finish to Finish - Work on a node cannot finish until work on another node has finished. - 4What do the node relationships show?Dependencies
- 5How can nodes be altered to included time dependencies?Nodes can also have modifications added with a lag or a lead introduced.
A lag is used with a Start to Start relationship. A subsequent node can only begin after the previous node has been running for the time displayed.
A lead is used with a Finish to Finish relationship. A preceding node can finish early by the amount if time displayed. - 6What time categories are attributed to nodes?ES = Earliest Start
LS = Latest Start
D = Duration
EF = Earliest Finish
LF = Latest Finish
TF = Total Float - 7What does a template network node look like?See page 175 of study guide for answer.
- 8How are the nodes used?To calculate a working knowledge of:
the earliest a project can finish; total float; free float and the critical path through the network. - 9What are the stages in calculating the critical path?1. Carry out a 'forward pass' (calculates early finish)
2. Carry out a 'backward pass' (calculates latest start)
3. Calculate the total float
4. Determine the critical path
5. Calculate free float - 10How is a network 'forward pass' carried out?1. Start at the far left in the first node. Add the duration to the early start:
Left to Right, ES + D = EF
2. Early finish from predecessor node is the early start of the subsequent node(s).
3. Always choose the higher number if you have a choice. - 11How is a network 'backward pass' carried out?1. Start at the far right in the last node. Subtract the duration from latest finish:
Right to Left, LF - D = LS
2. Earliest finish in last node is latest finish for that node.
3. Latest start from successor node is the latest finish for the predecessor node.
4. Always choose the lowest number if you have a choice. - 12What is the definition of total float?"The amount of time by which a task (node) can be delayed before it affects the end date of the project"
Highlights tasks that must be completed on time to keep the project on schedule. - 13How is total float calculated?Subtract the early finish of a given node from the latest finish of same node:
EF - LF = TF - 14What is the critical path and how can it help the planning process?The tasks with the lowest combined total float in a network.
Actively engaging in the thinking about the detail can help improve plan quality. - 15What is the definition of free float?"the amount of time by which the end of a task can be delayed before affecting any subsequent tasks."
Free float is the gap between the end of one task and the start of the next.
Free float does not affect the finish date of the project. - 16How is free float calculated and displayed?Subtract early finish of current task (CT) from early start of successor task (ST):
EF (CT) - ES (ST) = Free Float
Free float is displayed above the node. - 17How is the completed network used?To produce a Gantt chart.
A Gantt chart shows tasks down the left-hand axis and the timescale across the top.
The tasks are represented by a bar or line from left to right covering the start and end of the task. - 18What are the benefits of a Gantt chart?Communication tool for showing progress to others.
Relative timings of network diagram related to absolute timings with reference to actual dates.
Tasks can be colour coded to show relevant relationships (i.e. critical/non-critical).
Shows milestones.
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- Description
- 9.1 explain the process for creating and maintaining a schedule 9.2 describe different techniques used for depicting a schedule (including network diagrams, critical path analysis, Gantt chart, milestone chart)
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- Althea Green
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