Both PERT, Program Evaluation and Review Technique, and CPM$,$ Critical Path Method, are widely used techniques for planning and coordination large projects. By using PERT and$/$or CPM Project Managers are able to obtain;

a$.$ Graphical displays of project activities

b$.$ Estimates of how long the project will take

c$.$ Indication of which activities are the most critical to timely project completion

d$.$ Indication of how long any activity can be delayed without delaying the project

e$.$ All of the above