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A Monitoring Plan for Detecting Product Degradation

FigurÄ™ 2. Log Pk = -K[c(l - R)].

unexpected. If the assessed failure ratÄ™ is concordant with the requirement, probational sampling at the ratÄ™ of 100 P2% can be continued.

Probational Sampling Starting with the unit immediately following the failed unit, c consecutive units are probationally sampled at the ratÄ™ of 100 P2%. If there is a failure in the c sampled units, testing reverts to initial sampling. If there are no failures in the c inspected units, sampling at a ratÄ™ of 100 P2% continues without probation. It is important to notÄ™ that the concordance rules do not hoÅ‚d during probational sampling siÅ„ce a process change may have occurred and a decision about current process quality should not be diluted by non-pertinent production history.