Reliability may be defined in several ways:

• The idea that something is fit for purpose with respect to time;
• The capacity of a device or system to perform as designed;
• The resistance to failure of a device or system;
• The ability of a device or system to perform a required function under stated conditions for a specified period of time;
• The probability that a functional unit will perform its required function for a specified interval under stated conditions;
• The ability of something to "fail well" (fail without catastrophic consequences).

The function of reliability engineering is to develop the reliability requirements for the product, establish an adequate reliability program, and perform appropriate analyses and tasks to ensure the product will meet its requirements. These tasks are managed by a reliability engineer, who usually holds an accredited engineering degree and has additional reliability-specific education and training. Reliability engineering is closely associated with maintainability engineering and logistics engineering. Many problems from other fields, such as security engineering, can also be approached using reliability engineering techniques.

Many types of engineering employ reliability engineers and use the tools and methodology of reliability engineering. For example:

• System engineers design complex systems having a specified reliability
• Mechanical engineers may have to design a machine or system with a specified reliability – see: Mechanical Engineering Translation
• Automotive engineers have reliability requirements for the automobiles (and components) which they design – see: Automotive Engineering Translation and, see also: Automotive Sector Translation
• Electronics engineers must design and test their products for reliability requirements – see: Electronic Engineering Translation
• In software engineering and systems engineering the reliability engineering is the subdiscipline of ensuring that a system (or a device in general) will perform its intended function(s) when operated in a specified manner for a specified length of time. Reliability engineering is performed throughout the entire life cycle of a system, including development, test, production and operation." Reference

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