Software companies large and small make these kinds of judgments on a daily basis during both the development process and the life span of a deployed product.
Environmental campaigners have lost a legal battle to limit the life-span of a landfill site near their homes in Wrexham.
But bacteria and viruses breed fast, so natural selection has time, within the span of a human life, to make a difference.
For example historically materials used in blue OLEDs had a life span of 14, 000 hours to half original brightness, compared to 40, 000 hours for traditional LEDs.
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Sceptics point out that if big cats have been surviving, and breeding, in the wild for all this time, they only have a natural life span of some 20 years.
In mammals, this kind of epigenetic modification has been assumed to last only during the life span of a particular animal, because such changes are usually erased in the sperm and egg cells.
ICO's ten satellites fly about 9, 000 kilometres higher in medium-earth orbit and have a life-span of 12 years.
All this activity occurs early in the life span of a galaxy, before it settles down into a quiet middle age.
The new regulations have doubled the life span of a Formula One engine in an attempt to cut costs and reduce speeds, forcing teams to use the same ones for two successive races.
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We are all trying to successfully navigate a world consisting of an infinite data set of human interactions while saddled with a very limited life span.
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This was the first fall in a decade and dashed hopes that the life span of the average Russian would beat the Gorbachev-era peak and exceed 70 years for the first time ever.
Now, think about the time you spent reading that very condensed version of events stemming from a misdemeanor marijuana arrest, and extrapolate it, across the span of months, into real life.
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It is true: many beneficial new therapies have extended the average life span and have driven a lot of the rise in costs.
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There is a high mortality rate -- with an average life span of only 47 -- minimal infrastructure and limited tools for economic development.
Mind you, the life span of these GSPs can be as short as a month or two.
Scientists have long speculated that the key to a person's "natural" life span lies in so-called diseases of aging, those that emerge only as the body begins to wear out.
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Whatever difficulties the Dreamliner may encounter over a service life expected to span half a century, batteries are likely to be the least of its problems.
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Yet, there is anecdotal evidence that they suffer disproportionately from a variety of physical and mental-health disorders that cut short playing days and possibly even their life span.
The draft regulations, which span dozens of pages, also describe a range of smaller measures that could change some of the key features of life in the capital, if strictly implemented.
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