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A criterion used to assess changes in system behavior, capability, or operational environment tied to measuring the attainment of an end state, achieving an objective, or creating an effect. 


The probability of an item to perform a required function under stated conditions for a specified period of time. Reliability is further divided into mission reliability and logistics reliability.

helping the soldier with maintenance
mechanic repairing


The ability of an item to be retained in, or restored to, a specified condition when maintenance is performed by personnel having specified skill levels and using prescribed procedures and resources at each prescribed level of maintenance and repair.