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Failure
Mode and Effects Analysis (FMEA) - A bottoms up systematic, inductive,
methodical analysis to determine and document the effects of identifiable
failure modes of all system hardware components. The FMEA will produce
a list of critical items that when failed, will cause hazardous results.
When combined with a Criticality Analysis, each critical component is
ranked in order of highest probability of failure, assisting in targeting
fixes in the most critical first.
Software FMEA a technique where critical software variables
or modules (functions) are presumed failed and an analysis of the effects
on the overall system. A Software FMEA will assist in locating software
processes or functions that are critical to system operation.
Reliability Block Diagram Analysis -
An analysis to determine a system's probability of success for a given
period. An RBDA hierarchically lists the contributors and detractors to
the system's reliability to show where the design can best be improved.
The RBDA analysis is the starting point for a Reliability Prediction or
Failure Mode and Effects Analysis.
Maintainability Analysis - An analysis to determine the probability
that a failed unit will be operationally restored within a given period
of time when the maintenance action is performed, (Mean Time To Repair,
MTTR).
Sneak Analysis - A powerful, topological
technique for exposing system anomalies that cause unwanted or unintended
events to occur even though no components of the system have failed. Sneak
analysis will also uncover anomalies that can inhibit a designed or intended
event from occurring. Sneak conditions are manifested as sneak paths,
labels, timing, or indications.
Hazard Analysis - Identification and evaluation of potential hazards
within a system and the recommendations for averting for the hazards are
suggested.
Preliminary Hazard Analysis - An analysis of the initial system
concepts to identify all the sources that consitute inherent hazards,
analyze them for possible accidents in every mode of system operations,
and to identify methods of protection against all possible
accidents.
Fault Tree Analysis - An analysis beginning
with an undesired system event that constructs a symbolic logic diagram
to show cause-effect relationships between the top undesired event and
one or more causes. IDA has now added system software events to the Fault
Tree showing end-to-end connectivity for the undesired event through microprocessor
based control systems.
HW/SW Interface Analysis - A Sneak analysis tailored only for the
interfaces between: Hardware/Software, Hardware/ Hardware, Subassembly-to-Subassembly,
etc, Software/ Software, and Custom-to-COTS.
Reliability Prediction Analysis - An
analysis to calculate the reliability (Mean Time Between Failure, MTBF)
of a system or component modules to establish a common basis for comparing
and evaluating related or competitive designs.
Worst Case Analysis - An analysis to
determine a circuit's performance by imposing the most undesirable circuit
tolerance limits to obtain the worst performance. This analysis assists
in designing reliability into the hardware and to identify overstressed
components.
Test Optimization Analysis - An analysis
of the design's hardware and software in order to formulate the most effective
tests necessary to verify system functionality. The analysis aids in writing
procedures that will effectively test the nominal and off-nominal conditions
imposed on the system. The results greatly streamline the test and verification
process in a design.
Software Reliability a combination of Software Sneak analysis
and a Software FMEA. These two analysis combined can uncover logic errors
performed by the software and program construction that may decrease the
"robustness" of the design.
Traceability Analysis or Requirements Traceability Analysis
an analysis of the systems requirements and requirements coverage
in the completed designs implementation. A very useful tool in design
verification to assure that all of the requirements have been implemented.
IDAs output product from this analysis produces a "waterfall"
type diagram allowing a trace of a lower-level requirement back to the
parent requirement(s). This can be very useful when performing system
modifications and identifying where in the system the changes will be
most effective.
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