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Spiral Prototyping Activity

If you thought the last slide was unusual, things are about to really
get strange!
In the spiral prototyping activity:
- Classes and class specifications are identified from the
partitioned/contracted subsystem.
The class specifications are as formal as needed, and are stored in the
class comment.
The system browsers should be modified as needed to support special
organizational specification needs, rather than require the developer to
leave Smalltalk
to use a different environment. These classes and class specifications
identify subsystem
collaborators, which may eventually be further broken down.
(String
is broken down as a Collection
of Characters
, for example.)
- Behavior is described in terms of method names and specifications,
which are stored
as method comments or in method associated storage.
- The specified classes and methods are implemented, producing
functionality.
- Functionality is tested, integrated, and reviewed in parallel,
producing possible
corrections that are fed back to implementation, additional subsystem
partitioning/contracting
information, and collaboration/responsibility criticism, as well as a
product.
- This activity is iterated as allowed by market opportunity windows
and resource budgets.
* In many organizations (particularly those that build hardware!)
"prototype" is a
dirty word, recalling blobs of solder and loose wires on an engineer's
bench. We
use the term to mean an unfinished product; feel free to substitute your
own term
if your organization is uneasy with the concept of "prototype
becoming product."
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