Decision, Fork, Join and Merge

Decision, Fork, Join and Merge:
You can add a decision to a process diagram to route input to one of several alternative outgoing paths. You can add two types of decisions:Simple decisions - to model true or false, yes or no choices and Multiple-choice decisions - to model decisions where there are more than two alternatives or where the alternatives are not mutually exclusive


You can add a fork when you want to perform two or more tasks in parallel. A fork makes copies of its inputs and forwards them by several processing paths.

You can add a merge or join to a process diagram to recombine processing paths, bringing several alternative flows back into a single flow. A join also synchronizes the flows, by combining two or more parallel paths that must all complete before they continue along a single path. You will typically use a merge after a decision and a join after a fork.