Understanding Constraints and Relationships in Primavera P6 8.2
Understanding Constraints in Primavera P6
Constraints are applied to Activities when
relationships do not provide the required result
and are often a result of External Dependencies.
Typical applications of a constraint are to constrain an
activity to a date for:
The availability of a site to commence work.
The supply of information by a client.
The required finish date of a project.
Constraints are often entered against Milestone activities
to represent contract dates and may be directly related
to contract items using Notebook Topics.
Constraints are covered in detail in
the Constraints chapter.
There are four types of dependencies available in
Finish-to-Start (FS) (also known as conventional)
Two other terms you must understand are:
Predecessor, an activity that controls the start or
finish of another immediate subsequent activity.
Successor, an activity where the start or finish
depends on the start or finish of another immediately
The following pictures show how the dependencies
appear graphically in the Bar Chart and Activity
Network (also known as PERT, Network Diagram and
Relationship Diagram Views):
The FS (or conventional) dependency looks like this:
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