Project Planning and Control Using Primavera Contractor Version 6: Including Versions 4.1, 5.0 and 6.1

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 as it only affects the Early dates calculation) 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 as it only affects the Late dates calculation) 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 |
|---|---|
|
| Open the Status tab on the Activity Details form. |
|
| The following columns may be displayed and the constraints assigned or edited:
|
|
| The Activity Details form has... |