In reliability theory, the bathtub curve is the phenomenon that the fraction of products failing in a given timespan is usually high early in the lifecycle, low in the middle, and rising strongly towards the end. Reliability theory developed apart from the mainstream of probability and statistics, and was used originally as a tool to help nineteenth century maritime insurance and life insurance companies compute profitable rates to charge their customers. ... New Product Development is a business and engineering term which describes the complete process of bringing a new product to market. ...
When plotted as a curve, this looks like the profile of a bathtub: For the foundations of the World Trade Center, please see The Bathtub A bathtub is a plumbing fixture used for bathing. ...
The "bathtub" curve hazard function
The bathtub curve is frequently applied to computer and other electronic memory devices, especially those in which data integrity is critical. The goal is to try and stagger the curve functions of separate vital data storage units so that the cumulative failure curve is kept to a lower probability. Source: U.S. Army document File links The following pages link to this file: Bathtub curve User:Wyatts User:Wyatts/Draft article B Failure rate Categories: U.S. Army images ...
The bathtubcurve consists of three periods: an infant mortality period with a decreasing failure rate followed by a normal life period (also known as "useful life") with a low, relatively constant failure rate and concluding with a wear-out period that exhibits an increasing failure rate.
Note that the bathtubcurve is typically used as a visual model to illustrate the three key periods of product failure and not calibrated to depict a graph of the expected behavior for a particular product family.
In this issue, Part One, we have introduced the concept of the bathtubcurve and discussed issues related to the first period, infant mortality, as well as the practices, such as burn-in, that are used to address failures of this type.
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