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11 Constraints

By Paul E. Harris
From Project Planning and Scheduling Using Primavera Version 4.1: For Engineering & Construction and Maintenance & Turnaround

Overview

Constraints are used to imposelogic on activities that may not be realistically scheduled with logic links. This chapter willdeal with the following constraints in detail:

  • Start On or After

  • Finish On or Before

These are the minimum number of constraints that are required to effectively schedule aproject.

Start On or After (also known as an Early Start or StartNo Earlier Than constraint) is used when the start date of an activity is known and does not havea predecessor. Primavera Version 4.1 will not calculate the activity early start date prior to thisdate.

Finish On or Before (also known as Late Finish or FinishNo Later Than constraint) is used when the latest finish date is stipulated. Primavera Version 4.1will not calculate the activity s late finish date after this date.

The following table summarizes the methods used to assign Constraints to Activities or how toadd notes to activities:

Topic

Notes for Creating a Constraint

  • Setting a Primary and Secondaryconstraint with the Activity Details form.

Open the Status tab on the ActivityDetails form.

  • Setting Constraints using columns.

The following columns may be displayed and the constraints assigned or edited:

  • Primary Constraint

  • Primary Constraint Date

  • Secondary Constraint

  • Secondary Constraint Date

  • Adding Notes, these could be about constraints or other activity information.

The Activity Details form has a Notebook tab, which enables Notes to be assigned to Notebook Topics.

Primavera Version 4.1 will permit two constraints against a given activity. P3 and SureTrakalso allow two constraints but Microsoft Project only permits one.

Copyright Eastwood Harris Pty Ltd 2005 under license agreement with Books24x7
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Topics of Interest

This chapter covers the ability of Primavera Version4.1 to control which activities are displayed, both on the screen and in printouts, by using Filters. 12.1 Understanding Filters Primavera...

Overview Constraints are used to impose logic on activities that may not be realistically scheduled with logic links. This chapter will deal with the following constraints in detail: Start...

Overview Constraints are used to impose logic on activities that may not be realistically scheduled with logic links. This chapter will deal with the following constraints in detail: Start...

Overview Constraints are used to impose logic on activities that may not be realistically scheduled with logic links. This chapter will deal with the following constraints in detail: Start...

Overview Constraints are used to impose logic on activities that may not be realistically scheduled with logic links. We will deal in detail with four constraints: Start constraint Early...