In engineering, reliability, availability, maintainability and safety (RAMS) is used to characterize a product or system:
Reliability: Ability to perform a specific function and may be given as design reliability or operational reliability Availability: Ability to keep a functioning state in the given environment Maintainability: Ability to be timely and easily maintained (including servicing, inspection and check, repair and/or modification) Safety: Ability not to harm people, the environment, or any assets during a whole life cycle.
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