In structured analysis there are three orthogonal views:
1. The functional view, made up of data flow diagrams, is the primary view of the system. It defines what is done, the flow of data between things that are done and provides the primary structure of the solution. Changes in functionality result in changes in the software structure.
2. The data view, made up of entity relationship diagrams, is a record of what is in the system, or what is outside the system that is being monitored. It is the static structural view.
3.The dynamic view, made up of state transition diagrams, defines when things happen and the conditions under which they happen
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