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In systems engineering, dependability is a measure of a system's availability, reliability, maintainability, and in some cases, other characteristics such as durability, safety and security. [1] In real-time computing , dependability is the ability to provide services that can be trusted within a time-period. [ 2 ]
Reliability: a key element for users who need the product to work without fail for an adequate length of time. Conformance : is the product made exactly as the designer intended. Durability : a measure of the length of a product’s life.
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)
Reliability Personally responsible; completes work in a timely, consistent manner; works hours necessary to complete assigned work; is regularly present and punctual; arrives prepared for work; is committed to doing the best job possible; keeps commitments. Responsiveness to requests for service
Reliability engineering is a sub-discipline of systems engineering that emphasizes the ability of equipment to function without failure. Reliability is defined as the probability that a product, system, or service will perform its intended function adequately for a specified period of time, OR will operate in a defined environment without failure. [1]
Reliability, availability and serviceability (RAS), also known as reliability, availability, and maintainability (RAM), is a computer hardware engineering term involving reliability engineering, high availability, and serviceability design. The phrase was originally used by IBM as a term to describe the robustness of their mainframe computers.
Reliability: the ability to perform the promised service dependably and accurately Assurance: the knowledge and courtesy of employees and their ability to convey trust and confidence Tangibles: the appearance of physical facilities, equipment, personnel and communication materials
Reliability declines as the time passes, and probability of failure increases until action is taken. The item will eventually fail if there is no intervention. Periodic maintenance increasingly reduces operational failure risks as procedure are used more often. Average reliability improves as the time between maintenance actions is reduced.