Download Analysis Within the Systems Development Life-Cycle. Book 3: by Rosemary Rock-Evans PDF

By Rosemary Rock-Evans

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2 A (type of) data flow is a set of related types of data which is input to or output from an activity. 3 A (type of) data store is a synonym for an entity type or entity group. 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.

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. 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.

14, showing the 'external' activities and 'scope', and now makes more logical sense because account details come from an activity which manages bank accounts and invoice details come from the activity of invoice issuing. Without these two external activities we had data without any obvious means of creation, but now we also have external activities receiving data, as follows: • The activity of receipt monitoring uses receipts • The activity of accounting uses deposits • The activity of accounting uses payments.

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