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The Software Building Activity

Introducing IDEF0 activity modelling:
- Each box is an activity
, identified with an active verb.
- Each activity must have at least one output
(if not, it is irrelevant), which is identified with a noun.
- Most activities will have one or more inputs
, identified by nouns. (Not too many things spontaneously produce output
without stimulus.)
- Each activity may have one or more resources
, identified by nouns, that are consumed in transforming the input to the
output.
- Each activity may have one or more constraints
, identified by nouns, that control the transformation of input to
output.
- Each activity can be expanded into two to seven (or so)
sub-activities, which we shall
see shortly. Typical activity models are expanded extensively. Due to time
constraints
(a bottom arrow on our tutorial presentation activity model), we will be
expanding only the shaded activities at each stage.
This diagram describes a typical top level activity of producing a
software product,
which is very similar for either the waterfall or spiral process.
The following diagrams expand on a selected activity, for both
waterfall and spiral
processes.
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