Project Scheduling Template Page 3
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11sequencing, lead and lag times between linked tasks, and minimum activity durations are
key inputs to ensure an accurate schedule is developed. A CPM schedule should be used
as the basis for establishing project schedules for King County projects.
Three-Point Estimating – Three-point estimating generates the most likely, the optimistic,
and the pessimistic schedule durations, taking into account the uncertainty of the
activities and durations, and the risk associated with achieving the schedule.
Methodologies for developing three point schedules are included in the PMBOK Guide.
King County baseline schedules should be based on either the most likely or pessimistic
schedule for the project, depending on the uncertainty and risk of key project elements.
The schedule baseline should in general not be based on an optimistic schedule.
However, the project manager should consider managing the project to achieve the
optimistic schedule.
Baselining – The baseline schedule is established and fixed near the end of Phase 2, and
it serves as the benchmark for calculating schedule performance for the project. The
Microsoft Project® scheduling tool has functionality to save and track variance from
baseline schedules. The most likely or pessimistic schedules developed from the three
point estimating technique should be used as the baseline schedule, depending on the
uncertainty or risk of the schedule elements. Each King County project should establish a
baseline schedule.
Schedule Monitoring Methods - are used to measure and report schedule performance, and also
to take corrective action during the project. These include:
Schedule Variance – This is the measure of schedule performance expressed as the
difference between the earned value and planned value of the schedule progress. The
Microsoft Project® schedule tool has a percent complete function that should be used to
track the amount of work completed on each activity, and compare the amount of work
completed to the amount of schedule expended.
Baseline Performance Monitoring – This method compares the current project schedule
to the baseline schedule. King County projects typically conduct schedule monitoring by
calculating variance of the start and end of each project phase, and also the substantial
completion milestone date (example: King County Project Information Center reporting).
The Microsoft Project® tool has functionality to compare current to baseline schedule.
3 - Key Considerations in Developing a Project Schedule
This section provides a list of considerations as an aid in preparing a project schedule for King
County capital projects. The key considerations are summarized in Table 1 below.
Table 1. Key Considerations for Developing a Schedule
When
Schedule Considerations
Identify critical schedule drivers (when project is needed, approval
Planning/Project
Charter
requirements, etc.)
Identify when funding will be available (grants, managed phase
appropriation gates, etc.)
Identify key scope items that are required, decisions/actions that control
the schedule, and key schedule constraints and assumptions.
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