??? Any change to requirements, design, or code must be (manually) reflected through all levels of
documentation to ensure all documents are consistent (which rarely happens).
then it is perfectly usable.
4.4.3 Cooper??™s Stage-Gate Process Model (Figure 4.2)
Cooper??™s
stage gate
model is a variant of the waterfall. It splits the life-cycle into six stages separated by
???gates.??? Each gate is a decision point. It differs from the waterfall in that the activities in each stage may
be simultaneous [Cooper].
???
Discovery stage:
a product manager thinks of a new idea for a product.
??“
Idea screen:
the idea is presented to potential stakeholders for their buy-in.
???
Scoping stage:
the market for the product is assessed and key features are identified.
??“
Second screen:
the idea is re-presented to potential stakeholders for their buy-in, but with
more-rigorous requirements and other information.
FIGURE 4.2
Cooper??™s stage-gate process model
Discovery
Gate 1
Idea screen
Scoping Business case Development
Launch
Gate 3
Go to
development
Gate 4
Go to testing
Gate 5
Go to
launch
Testing
Gate 2
Second
screen
Test Planning and Management
45
???
The business case stage:
in which the product, market, organization, project management and
environment, competitors, budget, RoI, and legal issues are defined.
??“
Go to development
is the moment at which the organization can commit to the large budget
required for development.
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