Progress in international standardization of verification and evaluation procedures

Procedures for estimation, compliance, and comparison of reliability characteristics are presented. Repaired and nonrepaired items are treated separately. For nonrepaired items, the procedures addresse the Weibull, normal, lognormal, and exponential (constant failure rate) distributions including goodness-of-fit tests. For repaired items, the procedures cover tests for trends (constant failure intensity) and trend analysis modeling based on the power law model. Related to the procedures, an overview of existing international standards and those in progress is given. A number of IEC publications being revised to cover both failure rate (nonrepaired items) and failure intensity (repaired items).<>