By Rosemary Rock-Evans
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Additional resources for Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables
4 Source/sink A source or sink is represented by a square box. 5 Data store/entity type or group A data store is represented by two parallel lines. 6 Event A n event is represented by a triangle (inverted) and is always placed outside the scope box and may be associated with a source (if the event is source-dependent) or may be 'stand alone'; for example, stock rusts. 15 which also includes four important symbols which represent scope, 'external' activities, 'exclusive' data flows and optional data flows.
As illustrated, all the diagrams can be used to express the same content—the choice is simply one of aesthetics, simplicity of drawing and ease of presentation. I like lists because they are easy to compile, neat to look at and easy to understand. 1 Networks of activities One fundamentally important point has not been mentioned yet. Until now the implication may have been that activity decomposition produces a true 'hierarchy' or tree structure. This is not the case. If we consider what is being represented rather than the mechanics of what we are doing, we realise that in real life there are many actions performed which satisfy more than one overall purpose.
20: Data flow diagram showing entity types or groups 37 This broad grouping, which describes what the business is set up to do (its purpose), can be decomposed into a network of successively more detailed classifications of the organisation's activities. For example, in order to achieve the overall activity of banking, this can be broken down into the sub-activities of lending money (to customers), borrowing money (from central bank, government and so on), managing money, providing services to customers and so on.
Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables by Rosemary Rock-Evans