The pie of project planning

If you've ever done any project planning, you may know that Douglas Hofstadter, in his book Gödel, Escher, Bach, formulated an important law, named Hofstadter's law:

It always takes longer than you expect, even when you take into account Hofstadter's Law

In practice, this recursive law is very hard to apply. I use a non-recursive variant myself that also takes into account project planning:

A carefully planned development project takes π times longer than you think. If you don't plan carefully, it will be π2

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