Fellow Technetters,

I'm in the middle of a 'frank and forthright' discussion at the moment on whether it is possible to justify substituting a set of environmental
tests carried out in parallel on a device i.e.. 10 devices go through vibration, another 10 go through high temp operating etc... for a customer
requirement for sequential testing i.e. take 10 devices and put them through all the tests.

I'm of the opinion that even if you up the severity of each parallel test it still isn't the same as a sequential test because you won't catch the
failure mechanisms that results from a combination of effects e.g.. high humidity weakening an adhesive joint which then fails the shock test. You
wouldn't see a failure if you tested 10 devices for high humidity and another 10 for shock.

I'd be interested in some opinions or some literature references which discuss this issue.

Regards,

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