Gert

The Graphical Evaluation and Review Technique (GERT) is a network model developed to deal with more complex modeling situations than can be handled by PERT/CPM. GERT combines signal flowgraph theory, probabilistic networks, PERT/CPM, and decision trees all in a single framework. Its components consist of logical nodes (defined below) and directed arcs (or branches) with two parameters; the probability that a given arc is taken (or "realized") and the distribution function describing the time required by the activity. Evaluation of a GERT network yields the probability of each node being realized and the elapsed time between all nodes.

At this point, it may be useful to compare GERT and PERT/CPM in order to focus on what is different about GERT.

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