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  • Writer's pictureSujoy Dutta, PMP

What is the process of weightage allocation and SPI calculation in Primavera?

In Primavera P6, Weighted Percentage Complete (WPC) is a method used to calculate the Schedule Performance Index (SPI). The process involves assigning weightages to activities based on their relative importance in the project and calculating the progress of each activity using these weightages. Here's a general overview of the process:

  1. Assigning Weightages:

  • Before starting the project, or during project planning, assign weightages to activities based on their importance, duration, cost, or other relevant factors.

  • You can assign weightages as percentages (e.g., Activity A = 20%, Activity B = 30%, Activity C = 50%) or any other scale that reflects their relative importance.

  1. Updating Activity Progress:

  • As the project progresses, update the progress of each activity in Primavera P6. You can update progress based on actual work completed, physical progress, or other relevant metrics.

  • Enter progress for each activity as a percentage complete (% Complete) or as actual duration or units completed.

  1. Calculating Weighted Percentage Complete (WPC):

  • Primavera P6 calculates the Weighted Percentage Complete (WPC) for each activity based on its assigned weightage and progress.

  • WPC for an activity = (% Complete of the activity) x (Weightage of the activity / 100)

  • For example, if Activity A is 50% complete and has a weightage of 20%, its WPC would be: WPC_A = (50% x 20%) / 100 = 10%

  1. Aggregating WPC for the Entire Project:

  • Sum up the WPC values for all activities in the project to calculate the overall progress of the project.

  • Total WPC for the project = Sum of WPC values for all activities

  1. Calculating Schedule Performance Index (SPI):

  • The Schedule Performance Index (SPI) is calculated by dividing the Total WPC by the sum of weightages for all activities in the project.

  • SPI = Total WPC / Total Weightages

  • SPI value greater than 1 indicates that the project is ahead of schedule, while SPI less than 1 indicates that the project is behind schedule.

By following this process, you can allocate weightages to activities based on their importance and calculate the Schedule Performance Index (SPI) using the Weighted Percentage Complete (WPC) method in Primavera P6. This allows project managers to monitor and analyze project progress more effectively, taking into account the relative importance of different activities in the project.

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