We all love a good plan, but we worry when things things don't go to plan. So here's a hot tip from Basecamp CEO, Jason Fried: replace “plan” with “guess” and take it easy. Because all plans really just guesses.
Taking it further:
"So next time you’re working on a business plan, call it a business guess. And that financial plan? It’s a financial guess. Strategic planning? Call it with it really is: a strategic guess. 5 year plan? You mean 5 year guess."