If you have familiar with UML (Unified Modeling Language) I am sure you also familiar with Activity Diagram. After we finish analyzing all requirement of software, we begin from identify all the actor and describe all the use case of each actor. On this example my actor is customer bank, that have many use case. For example withdrawCashMoney use case. I want to show my exercise the activity diagram on the withdrawCashMoney use case. I used Enterprise Architecture (EA) for drawing this diagram.
Ok, this is just my excercise. may be you can make better than me.