I don't think I can say it better than it has been done here:
From Small Fish Business Coach - Carl Dierschow - a clear sentiment on the one page versus the 30 page business plan. It all depends on what you need it for. For real change, you need to be clear and concise.
With year end always comes reflection and a (hopefully) fresh look at the new year. I intend to take this reminder of the value of the one page business plan and put it to good use - monthly - maybe more.
Will let you know how it goes!