Project Planning & Scheduling Using Primavera Contractor Version 4.1: For the Construction Industry

Chapter 11: Constraints

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 On or After

  • Finish On or Before

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

Start On or After (also known as an Early Start or Start No Earlier Than constraint) is used when the start date of an activity is known and does not have a predecessor. Primavera Contractor will not calculate the activity early start date prior to this date.

Finish On or Before (also known as Late Finish or Finish No Later Than constraint) is used when the latest finish date is stipulated. Primavera Contractor will 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 to add notes to activities:

Topic

Notes for Creating a Constraint

  • Setting a Primary and Secondary constraint with the Activity Details form.

Open the Status tab on the Activity Details 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.

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