Reducible GERT Networks

We have seen in chapter 3 that STEOR networks can be evaluated in a relatively easy manner by means of the MRP method. Nodes with AND entrance or IOR entrance, however, cause some difficulties. Therefore, it suggests itself to investigate GERT networks all of whose AND nodes and IOR nodes lie inside special subnetworks which can be reduced to structures containing only STEOR nodes. Obviously, the reduction of those subnetworks to “STEOR subnetworks” should be done such that the “reduced” GERT network is equivalent to the original (“reducible”) GERT network.