TABLE OF CONTENTS The next phase of a schedule is to add the logic to the activities. There are two types of logic that you must understand:
The first is the logic links or relationships between activities and
The second is the imposed constraints on the activities.
There are four types of relationships available in P3; they are Finish-to-Start ( FS) (also known as conventional), Start-to-Start ( SS), Start-to-Finish ( SF) and Finish-to-Finish ( FF).
Two other terms you must understand are:
Predecessor, an activity that controls the start or finish of another activity, and
Successor, an activity whose start or finish depends on the start or finish of another activity.
If you were to draw a FS relationship (or conventional) it would look like this:
While the SS relationship looks like this:
The SF relationship looks like:
The FF relationship would be:
An example of a FS with positive lag:
and an example with negative lag:
Lag is calculated on the predecessor's calendar.
Important You must be careful when using a lag to allow for delays such as curing concrete when the predecessor is not a seven-day calendar. The concrete will cure while the predecessor calendar has non-work days.
There are a number of methods for adding logic to activities. This chapter will look at the following techniques:
Graphical adding, editing and deleting relationships,
Series Link and Unlink,
Successor and...
