A transaction request context diagram shows the validated customer access so it can either reject the transaction or end the session. Following this, the details of the transaction are obtained so that the transaction is validated again. As per the transaction request, context diagrams can be expanded to show a more detailed data flow diagram. The single process of the context diagram is broken down into several main processes and must include storage which previously was lumped inside the single process of the context diagram. Instead of creating a transaction request context diagram from scratch, use EdrawMax as it has some fantastic features that let you create a diagram that can be exported into multiple formats.