Events and activities in PERT & CPM

Events and activities in PERT & CPM.  (Oct 2004)

Activities-

1. Activities represent actions which are represented by Arrows.
2. Activities consume resources and time.
3. Every activity has a Tail event (start) and Head event (end).
4. Activities can be critical or non critical. Critical activities represent critical path.
5. Critical activities have zero floats.

Events –

1. Events represent point of time. They are represented by Nodes or circles.
2. Events do not consume any time or resource.
3. An event represents start or end of an activity.
4. An event may be critical or non critical. Critical events have zero slacks. Critical events connect critical activities.