How to use Activity Duration Type in Primavera P6

In Primavera P6, when we assign resource to activity there is a equation:

Original Duration x Units/Time = Total Units

(          10 days        x 8 hours/day = 80 hours         )

How to use Activity Duration Type in Primavera P6-6

Now when you change duration, which element will be changed: Units/Time or Total Units?

That’s when Activity Duration Type come in to play.

The above equation must always be true.

The Duration Type rule determines which field has the most importance (value will be fixed). Below is a matrix that identifies which fields are recalculated based on the Duration type.

How to use Activity Duration Type in Primavera P6-1

  • If the duration is fixed, P6 will never recalculate the duration.
  • If the duration is not fixed, P6 will always recalculate the duration.

Let’s do some exercise to understand it.

Fill in the columns in the table below so that the equation remains true.

Duration Type: Fixed Units/Time

How to use Activity Duration Type in Primavera P6-2

Duration Type: Fixed Units

How to use Activity Duration Type in Primavera P6-3

Duration Type: Fixed Duration & Units

How to use Activity Duration Type in Primavera P6-4

Duration Type: Fixed Duration and Units/Time

How to use Activity Duration Type in Primavera P6-5

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