Definition: Scheduling
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- Created by: Annagc
- Created on: 25-03-24 13:21
What is time scheduling?
' A collection of techniques used to develop and present schedules that show when work will be performed
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Scheduling step 1: Identify activities
Define activities you need yo do to create each work package, the subject matter expert or team member should do this as you may not have the technical expertise to define them
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Scheduling step 2: Create network diagram
Use the work packages defined in the WBS to create a network diagram which defines the sequence in which the activities will be completed. It shows the dependencies (logical relationships) between each work package e.g. B can't be done until A has finishe
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Logical relationship: Finish to Start (FS)
Predecessor activity must finish before the successor activity can start (most common)
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Logical relationship: Start to Start (**)
Predecessor activity must start before the successor activity can start
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Logical relationship: Finish to Finish (FF)
Predecessor activity must finish before the successor activity can finish
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Logical relationship: Start to Finish (SF)
Successor activity must start before the predecessor activity can finish (very rare)
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What is a lag?
A lag enhances a network diagram when added to specific logical links - it creates a defined delay in the relationship represented by the inclusion of a + sign accompanied by the required time delay e.g. FS + 3d (lag)
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What is a lead?
A lead enhances a network diagram when added to specific logical links -it indicates an overlap between two linked activities represented by the inclusion of a - sign with the required overlap e.g. FS - 2d (lead)
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What is the Critical Path?
the 'sequence of activities through a project network from start to finish, the sum of whose durations determines the overall project duration'
It can also be the longest duration through the network, the shortest time the network can take and the path of
It can also be the longest duration through the network, the shortest time the network can take and the path of
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What is the total float?
The amount of time an activity can be delayed or extended without affecting the total project duration /end date
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What type of activities have a small float?
Near - or sub-critical activities
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What type of activities have a large float?
Bulk work activities
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Why is the critical path important?
It focuses attention on the activities which could affect the project duration if delayed, this helps you to allocate resources and analyse risk, it helps you align with key milestones which is useful for reporting progress
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How is the critical path generated?
By analysing the logical network of activities by calculating the start and finish dates of activities in two 'passes' the forward pass and the backward pass
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What is the forward pass?
This calculates Early Start (ES) and Early Finish (EF) dates for each activity, starting at the first activity and working through to the last activity in the network
EF = ES + D (duration)
EF = ES + D (duration)
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What is the backward pass?
This calculates the Late Start (LS) and the Late Finish (LF) dates of activities from the final task backwards
LS = LF - D (duration)
LS = LF - D (duration)
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How do you calculate the total float? (the amount of time an activity can be delayed without affecting the end date)
Late Finish - Early Finish
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What is the free float?
The amount of time an activity can be delayed or extended without delaying the start of the succeeding activity.
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How do you calculate the free float?
Early Start of the next task - Early Finish of current task
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What does the critical chain aim to understand?
The shortest time to complete all activities in a logical order
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What does the critical chain place emphasis on?
Resources (labour and non-labour) in a project
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What practices does the critical chain aim to avoid?
Multitasking, not starting planned work at the earliest start and not committing time right up until it's finished
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How does a critical chain use the float?
Instead of holding the float in each task, it is stripped out and included as a buffer for a critical chain of tasks. This is using optimistic estimates allowing us to identify most float so the buffer is as large as possible.
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Gantt chart: bar length
Indicates duration of a task
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Gantt chart: start/finish date
Tasks are positioned at earliest start/finish dates, showing any float at the end
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Gantt chart: Logical connections
You can choose whether to include logical connections
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Gantt chart: Summary tasks
It can be rolled up into summary tasks and also show key milestones
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Gantt chart: Critical path
Often shown in red
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Gantt chart: Baseline
Can show comparison of the current plan to the original plan
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Gantt chart: How is it generated?
Typically using planning software
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What three pieces of info do you need to create a Gantt Chart from the critical path analysis?
Earliest start, earliest finish and latest finish
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What are the three steps to creating a Gannt Chart?
1) The task starts at 'earliest start' 2) the task ends at 'earliest finish' 3) If there is a total float, this starts at 'Earliest finish' and ends at 'Latest finish'
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Other cards in this set
Card 2
Front
Scheduling step 1: Identify activities
Back
Define activities you need yo do to create each work package, the subject matter expert or team member should do this as you may not have the technical expertise to define them
Card 3
Front
Scheduling step 2: Create network diagram
Back
Card 4
Front
Logical relationship: Finish to Start (FS)
Back
Card 5
Front
Logical relationship: Start to Start (**)
Back
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