By Rosemary Rock-Evans
Read or Download Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables PDF
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Additional resources for Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables
Perhaps a large fuzzy entity grouping has been recognised as being composed of two entity types or one fuzzy group has been decomposed into a less fuzzy group but still cannot be directly related to entity types. 3 The input and output of activity A 3 has been conserved at the next level down overall. The level 2 diagram still has its overall input as data flows 3, 6 and 8 and overall output as data flow 9, even though 9 has been decomposed. 34: DCE's conventions for showing sequence, iteration and selection 49 Firm up course running details Obtain/record student list xxx Confirm provisional course giving If course running c o n f i r m e d U p d a t e teacher's course schedule - xxxxx r— Identify teachers able to give course fl For each course running !
Events are out of the control of the business and are like an 'external' activity—they are external to the business system. Activities are consciously invented to deal with events, so a business may create activities which deal with the fact that cars rust, people die and machines break down. For example, 'maintenance' activities may be created to deal with machine breakdown. Events are the 'stimulus' or 'trigger' for activities and are vital to analysis. In effect our system exists, in part, to handle events.
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