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I asked our local object-oriented expert here at work, and here's the
response:
There is a shareware version of Playground that does object-oriented
diagramming. It uses the Coad/Yourdon notation. (You didn't specify
which
notation was desired.) It also does object scenario diagrams. The tool
is
available for free at http://www.oi.com.
Ginny Beatty
Systems Technical Writer
CompuServe, Inc.