Data dictionaries are needed to describe the data and command flows, and a process specification is needed to capture the transaction/transformation information. Bubbles are usually grouped into higher level bubbles to decrease complexity. Bubbles that need to interact are then connected until the system is defined. One approach is to first define events from the outside world that require the system to react, then assign a bubble to that event. ![]() The flow of data and control from bubble to the data store to bubble can be difficult to track and the number of bubbles can increase. ![]() ![]() Structured analysis consists of interpreting the system concept (or real world situations) into data and control terminology represented by data flow diagrams. Structured analysis became popular in the 1980s and is still in use today.
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