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Expand-Contract in the Spiral Model

An important idea not readily found in the literature is that of
contraction
as an ongoing part of the process. It can take place within an hour,
within a cycle,
or perhaps every other cycle -- ideally it should happen on multiple time
scales.
Horror Story
One company insisted that Smalltalk development proceed in strict
accordance with traditional waterfall project management techniques. They used a large
consulting company's design methodology, which enforced waterfall project
management.
Upon staffing up with experienced Smalltalk consultants for the
implementation phase, they were horrified to discover that their Smalltalk experts were
unanimous in declaring that certain locked-in design decisions were inappropriate for a Smalltalk
project. They were unwilling to re-examine their design, and so instead
switched to a different implementation vehicle (which was, surprisingly enough, supplied by the
large consulting company that sold them the design methodology).
Outcome: when last we checked, project was about 18 months behind
schedule, and had consumed 16 times the resource of the original Smalltalk project plan.
Moral: be prepared to change your development and management style, and
avoid raising unrealistic expectations.
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