Stuff For Sale
2004 Summer Tour
In The Press
Veggie Van Gogh
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Spiral Production Activity
In the spiral software production activity:
Some interesting differences can be identi ed with this process:
- Developers, aided by marketing, again discover a conceptual basis for
solving a problem,
constrained by market requirements.
- Again, developers take a conceptual specification and develop the
by legacy systems and market opportunity windows. However, they have two
outputs: components that can be applied to similar concepts, and
modify the concepts upon which they develop their product.
- In addition to assuring customer satisfaction, maintainers produce
reusable test cases,
and provide early and continuous feedback to the development activity.
Let's look at the spiral development activity in more detail.
- Multiple feedback loops catch problems as early in the process as they
can be identified.
- Although not expressible in IDEF0 syntax, the feedback loops are
, meaning they tend to minimize the impact of the inputs, resources, and
Negative feedback is a stabilizing influence.
- Waterfall feedback tends to be positive
, or amplifying
feedback, due to the long periods involved. For example, developers are
on another project by the time defects come in from testing, so they
to bug fixing, which subsequently reduces the quality of their present
increases the number of defects.
- Roles are shared: maintainers have a development responsibility,
developers must understand
at least some market needs.
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