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What - Dependency Modeling as a means
of solving Diagnostic and Testability problems began in the 1960's. The
innovation was that by using cause-and-effect reasoning, a process could be
devised to detect and isolate faults based on how they could be observed.
Why - Dependency Models can be used to solve
diagnostics, testability and even prognostics problems. They also have some
applicability to solving Design-for-Test, System Engineering, Reliability,
Maintainability and Life Cycle Cost problems. This is because they can be used
to directly answer questions about fault detection, isolation and other fault
group statistics.
When - Dependency Models can be used at any
phase in the design process, but because they represent
History - Dependency Models were first
created for Diagnostics by Ralph De Paul Jr., founder of
DSI International. Initially called Logic Modeling, the approach became
the basis of all of today's model-based testability tools. Over the years, it
was the source of much debate as to its capabilities, because it is such a
low-level way of describing cause-and-effect relationships. It is primarily the
lack of it being a high-level approach, as opposed to there being any specific
deficiencies, that has lead to today's more modern high-level modeling
approaches.
Related Links - Functional
Dependency Models, Failure Mode
Dependency Models, Hybrid Diagnostic Models
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Diagnostics
/ Prognostics
System
Engineering
Safety