Stress–strength_analysis
Stress–strength analysis is the analysis of the strength of the materials and the interference of the stresses placed on the materials, where "materials" is not necessarily the raw goods or parts, but can be an entire system. Stress-Strength Analysis is a tool used in reliability engineering.
Environmental stresses have a distribution with a mean and a standard deviation and component strengths have a distribution with a mean and a standard deviation . The overlap of these distributions is the probability of failure . This overlap is also referred to stress-strength interference.