By Rosemary Rock-Evans
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Client details have been added to enable the payment to be processed and bank details have been added so that the deposit can be prepared. Additional external activities have also been added to provide us with this information. It should now be very clear how dependent the DFD and entity model are on each other or, to put it another way, activity and entity analysis are totally dependent on each other. 9 Other names for DFDs Many firms and consultancies use different names to describe the same diagrammatic technique.
1 What does it represent? When the concepts of activity analysis were introduced, the activity was defined as a classification of actions. As we know, classification means grouping like actions together and giving them a name which represents that type of action. What may not have been obvious at that stage was that the extent of classification was not defined in the definition—there were no rules which said that an activity type is a classification of 'low level' actions directly representing the action.
No sort is necessary (database software can remove this need), no data is duplicated and there are fewer programs (meaning less coding effort). This is an altogether better solution, made possible by recognising 'state'. Its use will be explored in more detail later in the book. 8 Summary We have seen that there are seven main concepts or deliverables used in activity analysis, the last three of which are only applicable to more detailed analysis. These concepts can be summarised as follows: 1 A n activity (type) is a type of thing which the business does or wants to do.
Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables by Rosemary Rock-Evans