That's a good example, preparing for a future which probably never comes. It is not easy to predict the future of a software application. In Louisiana they wer

That's a good example, preparing for a future which probably never comes. It is not easy to predict the future of a software application. In Louisiana they were building levees to withstand a once in 100 years flood or something like that. Based on historical weather reports they are able to estimate how high and strong the levees would need to be. But with software it is hard to see how we could estimate what kinds of requirement-changes might be needed during the next 100 years for any application.