Analysis Within the Systems Development Life-Cycle. Book 3: by Rosemary Rock-Evans

By Rosemary Rock-Evans

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Extra info for Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables

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A picture represents a 'common language' between user, analyst and designer which can be understood and is far more efficient than text. Furthermore, as the analysis progresses, constant feedback is possible, using the picture as a basis. Diagrams are also easily maintained, meaning they are more likely to be up to date. Any changes, whether they be made during analysis or after the project has gone live, can be easily incorporated because it can be seen where the changes need to take place. Enhancements are also easier, for the same reasons.

Returning to the activity decomposition and DFD example, we can see that no external activities exist at the stage shown. 40. In this case a 'dotted circle' (or broken bubble) is used but is placed outside the diagram as opposed to those which are outside the scope of the project and are the external activities. If we look again at the activity decomposition and DFD example, and particularly the level 3 decomposition, a new feature is shown—the common activity X . What should be done now with the DFD?

We have already seen, in entity analysis, that diagrams more succinctly represent factual detail than text. They are a precise, compact means of representing factual information and as a means of communication they are ideal. A picture represents a 'common language' between user, analyst and designer which can be understood and is far more efficient than text. Furthermore, as the analysis progresses, constant feedback is possible, using the picture as a basis. Diagrams are also easily maintained, meaning they are more likely to be up to date.

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