The very definition of a project includes a set of inter-related activities done by a group of people (according to the PMI®). Activities are linked to each other using relationships in the sequence in which those activities must be performed. There may be one or more paths of related activities, but one subset of them will be critical, meaning that the rest of the schedule is driven by the activities on that path.
There are four ways to relate activities to one another (types of relationships):
Relationships will be described using three abstract activities, called A, B, and C.
This is the most logical and most often used relationship type. In this case, A ...