The equipment life span can be represented typically in a diagram representation of a bath-tub curve as failure rate dependent on technical devices or systems on the life span.

The abscissa shows the time interval t von Beginn of the start-up of the equipment, while on the ordinate the failure rate is laid on \ lambda per time unit. Reliable data are possible only if a statistically sufficiently large quantity of devices is consulted. With a well developed product the curve of the failure rate takes the form of a bath tub: The rate is at the beginning (I) and at the end (III) of the life span particularly highly, during it in the period between them (II) lower and quite constant is. The phase I is typically shorter than third, which can persist for some durable products for a very long time.

The reasons for this effect lie on the one hand in the fact that construction, production or lack of material frequently equal to beginning of the enterprise are noticeable and/or lead to damage. After these teething troubles in such a way specified are repaired, the enterprise can function continuously over the time. It comes only isolated to damage. To the end the life span again strengthen losses or damage step up. These are to be due mainly to aging and wear. If this range is reached, either larger repair measures or replacement are necessary.

In our society products are thus developed often on "life span ", on a predetermined service life. A goal of this development can it be attained at the end of the service life with all components at the same time the final range of the bath-tub curve. A repair is not worth then no more; the product should be replaced by a new (the newest state of the art appropriate). Frequently such products are also in such a way designed that a repair is not only difficult more difficult possible or. For example no replacement is possible with a break of the mains cable with hand attachments as a hair dryer, because the equipment cannot be opened or only by the expensive work service.

Biological systems and bath-tub curve

There are organisms in the special one surprisingly for biological systems generally and perhaps a similar bath tub curve, whose data are specified however in the dying board. This curve corresponds for instance to the part of II and part of III of the bath-tub curve, part of I is against it hardly to be recognized. This is above all because of the fact that this curve considers not the probabilities with that a germ does not reach the birth. With a consideration of these probabilities one would recognize a very steeply dropping part of I clearly.

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