CPM vs. PERT
tool to analyze project and determine duration, based on identification of "critical path" through an activity network.
Knowledge of the critical path can permit management of the project to change duration.
A single estimate for activity time was used that did not allow for variation in activity times
Activity times are assumed to be known or predictable ("deterministic")
Activities are represented as nodes or circles
CPM or "Critical Path Method":
PERT or "Project Evaluation and Review Technique":
- Another derivative of the GANTT chart
- Multiple time estimates were used for each activity that allowed for variation in activity times
- Activity times are assumed to be random, with assumed probability distribution ("probabilistic")
- Activities are represented by arrowed lines between the nodes or circles
Over time, CPM and PERT merged into one technique referred to as "CPM/PERT".
Visually easier to see precedence relationships
Ideal for large projects with many activities
They consist of a network of branches and nodes.