By Rosemary Rock-Evans
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Additional info for Analysis Within the Systems Development Life-Cycle. Book 3: Activity Analysis–the Deliverables
Let us examine this further. A 3 has been further decomposed into A 3 . 3. A DFD has been drawn showing the dependencies, in which the following should be noted: 1 The DFD has only been produced for that 'leg' of the hierarchy—no attempt is made to link it with the other DFDs produced by decomposing A l , A 2 and A 4 . 2 The output of data flow 9 has been decomposed into two parts. 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.
4 A source/sink is a person, machine, organisation, or part of an organisation which is an originator or receiver of one or more data flows. 5 A n event (type) is a type of change which can occur to an entity or an association between entities which is in its control, not the businesses. 6 A message is a type of communication. 7 A n entity state is a discrete, discernible period in the life-cycle of an entity type. 1 Introduction This section describes the two main diagrammatic techniques used in activity analysis to represent the main concepts or 'prime deliverables'.
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 !