Designers do not have complete models of dependency, only partial ones. They
can build complete but temporary portions of the model when details of dependencies
are needed. Results from such an effort may get included in the designer's current
model.
3.3 DDB: The Design Data-base
By analyzing the way the designer works and by looking at the content of the
drawings used by the designer it is clear that a layered design data-base is required.
This allows a designer to make changes with various levels of commitment. The
"outer" level can be considered to be the most doubtful. Once more evidence has
been accumulated that a value is likely to b
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