What is bathtub curve?
The bathtub curve is a type of model that shows the likely failure rates of technologies and products. During a given product life, the bathtub curve shows how many units can fail during a given phase of a three-part timeline. The first downward part of the curve is known as the 'Infant Mortality Period' and shows how a number of units would quickly fail due to defects or other problems. The second part of the curve is the 'normal life' or 'useful life' segment with a low failure rate. The third part is a higher end-of-life failure rate. Together, these three segments look like a bathtub with two steep edges and a flat bottom.
A function of the bathtub curve is to show the likelihood of initial product failure. Companies are trying to eradicate the first stage of infant mortality by refining products and technology to eliminate 'dead on arrival' products. There is a feeling that products that fail quickly turn customers away. Organizations could use specific tasks like a Highly Accelerated Life Test (HALT) or a Highly Accelerated Stress Test (HAST) to encourage the engineering of more durable and durable products. Technology professionals could talk about eliminating the root causes of 'child mortality defects'. All of this is part of a specific product development and quality control in the corporate world.