Our approach to a theory of how failures are handled during design is colored by
beliefs that the knowledge available for use in failure handling is restricted, that a
social metaphor is applicable, that failure handling is mainly a local rather than global
process, and that failure handling processes are domain-driven. We will discuss each
of these in turn below.
4.1.1 Restricted Knowledge
Much of the work on failure handling in the literature considers al] relevant
knowledge to be available at failure time. If one views the problem solver's complete
internal model a ...
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