Life prediction or performance assessment is primarily done for bearings or gears with recognition of the significant role
of stress level to such assessments. Reliability or probability of performance is known to relate to the stress-life
relationship but the details as to how these interact are not often clearly defined.
This paper details the experimental basis for the relationship between stress (load), life and reliability for bearings and
gears considering the similarity and differences of their respective systems. The role of stress level and life scatter in
terms of the Weibull distribution will be addressed. The background and equations to calculate the reliability factors, as
included in both bearing and gear standards, are then developed.

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