The 37 Signals guys don’t think so–They say “Planning is Guessing”. Check out their book “Rework”– I’ve used concepts from the book in many talks, conversations and business meetings and it’s been a wonderful tool.
Don’t get me wrong– I love the book, but my take is that there is a risk that the “Planning is Guessing” proverb can be taken out of context and used to justify a lack of critical thinking on a concept or even a business.
I’ve personally always found it valuable to go through the following exercise at least once a quarter:
Try using this model the next time you get stuck…