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Guy:
I agree with you that processes, top level or otherwise are a connected series of activities intended to achieve a desired outcome.
You are right in that a process can exist without having any inputs or outputs - a clock being a good example. In general though, processes have inpuits and outputs. One of the "red flags" a data flow diagrammer looks for is processes (functions) without inputs or outputs. Generally, such flags that the diagrammer is forgetting about a data flow.
Tony
Tony,
Thanks for the reply.
I think bascially we agree then - I certainly agree that a process generally have inputs and outputs, they just aren't defined by them.
BTW - I have heard a rumour that in the UK ISEB are removing DFDs as a legitimate form of process modelling from their exams (that lead to the ISEB Diploma in Business Analysis). If its true its interesting to wonder why...
Guy
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