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Message: <blockquote data-quote="Mustrum_Ridcully" data-source="post: 4406341" data-attributes="member: 710">Well, my experience is that it seems too work well, at least for IT projects. I have no idea why it works that way. One of my guesses might be: In an ideal world, where it was only you (and your team) making all the shots and developing the software, it would take the original estimated time.But every time you have to make an estimate, you have to give it to someone above you. And that one above you will not just want to hear your estimate. He will set the goals of the projects - and he will change them. And he will want to instill a feed-back look. Which adds time again, as you build something, show it to him, and he eventually comes back to you with new suggestions. And if he has to give the estimate to someone above him, the same happens again. These matters of indirection take time. It can take days until you get feedback to something you developed. And in these days there is a reasonable risk that whatever you do, is invalidated by the response, or must be reworked if you want to work in the response.</blockquote>