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Additional info for Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables
These represent a scope at overview or feasibility study level (that is, above this in the activity decompositon diagram will be a number of strategic activities and levels). The scope has been defined as 'procurement'. 42b shows this overall activity at the top of the activity decomposition diagram. The same figure shows how this overall activity has been decomposed. 42b: Activity decomposition example Order amendment - activity decomposition diagram 57 • • • Progress chasing—monitoring the progress of purchase orders after they have been sent Shipping—arranging for the shipment of the delivered goods to site Invoice handling—the processing of invoices received from the supplier.
14: An example data flow diagram 31 dependent. This point will be explained further when we have examined the symbols used on the diagram. 2 Activity A n activity is represented by a 'bubble' or circle. 3 Data flow/entity state A data flow is represented by a line and an arrow to represent direction. Where the state of the entity is important, it is written on the data flow line. 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.
We can think of an external activity as a 'hook' which shows us where each application area fits together so that, like a series of press studs, we could pop them together and all the DFDs would fit and link up to produce one large diagram. However, note that this is not what we do. The overall result would produce a massive and highly complex diagram, but it must be remembered that it should be possible to do it. Returning to the activity decomposition and DFD example, we can see that no external activities exist at the stage shown.
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