HALT, Highly Accelerated Life Testing is a test-to-failure approach to
determine weak designs. You don't ever "pass" HALT, you just reach a point of
diminishing returns from a design cost/improvement ratio. There are various
parameters that change such as vibration, temperature and humidity. All those
change in a predetermined (or not) pseudo-random fashion. It is an excellent
approach to determine quickly what the likely warranty returns will be or what
the long term failures will be!

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