A procedure for the formulation and evaluation of systems using a network approach. Problem solving with the GERT (graphical evaluation and review technique) procedure utilizes the following steps:

1. Convert a qualitative description of a system or problem to a generalized network similar to the critical path method—PERT type of network.
2. Collect the data necessary to describe the functions ascribed to the branches of a network.
3. Combine the branch functions (the network components) into an equivalent function or functions which describe the network.
4. Convert the equivalent function or functions into performance measures for studying the system or solving the problem for which the network was created. These might include either the average or variance of the time or cost to complete the network.
5. Make inferences based on the performance measures developed in step 4.