Reliability engineering is an engineering field, that deals with the study, evaluation, and life-cycle management of reliability: the ability of a system or component to perform its required functions under stated conditions for a specified period of time.[citation needed] It is often measured as a probability of failure or a measure of availability. However, maintainability is also an important part of reliability engineering.

Reliability engineering for complex systems requires a different, more elaborated systems approach than reliability for non-complex systems / items. Reliability engineering is closely related to system Safety engineering in the sense that they both use common sorts of methods for their analysis and might require input from each other. Reliability engineering has important links with Function analysis / Requirements Specification, Systems Design, Hardware Design, Software Design, Manufacturing, Transport, Handling, Storage, Spare parts, Operations research, Human factors: Human Operators and maintainers, Repair shops, Manuals, Training and more. Most industries do not have specialized Reliability engineers and the engineering task often becomes part of the design engineer, logistics engineer, systems engineer or quality engineer. Reliability engineers should have broad skills and knowledge.



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