| availability | the fraction of time that a piece of equipment is expected to be available for operation.
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| bathtub curve: a description of the changing failure rate of a product over its lifetime decline | the fifth or final stage of the product life cycle, when the demand for the product has just about phased out and it is the time to find new products to produce and market.
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| exponential functions | mathematical functions that incorporate the constant e, the base of natural logarithms.
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| independent events | events whose occurrence or nonoccurrence do not influence each other.
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| infant mortality | the first stage of the product life cycle in use, characterized by high but declining failure rate.
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| mean time between failures (MTBF) | the average length of time between failures of a product or component.
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| redundancy | if a specific component fails, a substitute component is available to take over the specified function.
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| reliability | the probability that a product, or component, or system will perform its intended function under a prescribed set of conditions..
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