By Rosemary Rock-Evans
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Additional info for Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables
For each file we require re-run points, security copies and so on. What is worse, the 'rejects' at each stage only appear on a listing. What happens if they are forgotten or lost? Even if they are not, effort is wasted in keying them. 13. In this there are only two basic programs in the 'job' which can be run at any time. No orders are lost, as the 'order file' contains them all, and a listing is produced which shows what must be corrected, but not what must be re-input. No sort is necessary (database software can remove this need), no data is duplicated and there are fewer programs (meaning less coding effort).
When the activities act—whatever they are doing—they will look at data which is in the correct state for them. 47. A. 44: Very fuzzy entity model, with group entity types rather than precise entity types • Vendor details also consist of actual vendor details and details of the types of goods or services they supply • The purchase order details sent to the vendor have been decomposed and found to consist of the original orders and any later amendments • The request is processed by order preprocessing.
4 Sequence, iteration and selection These three constructs have been recognised and described many times. They are well accepted and proven constructs which are as applicable to activity decomposition as they are to systems and program design. All the diagrammatic techniques used to express activity decomposition have conventions for sequence, selection and iteration, but unfortunately they are all different! Therefore, I did not know whether to describe them all, at the risk of confusing the reader, choose one or two as examples, or only recommend one.
Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables by Rosemary Rock-Evans