I’m working with a promising book: Mastering the Rockefeller Habits by Verne Harnish. In it are tools to capture and distill the essence of a business’ purpose into a one-page strategic plan.
The author has made several downloads available, including a ‘how to’ that will help you through your first run (click on the sections “people”, “strategy”, “execution” or “cash). The planning tool requires a solid understanding of where you want to take the business so that you can identify and drive your top goals. It will even help you flesh those out if you, like me, discover mid-plan that you have some weaknesses in that area.
I recommend the book and its tools. Just for the record, I have no commercial affiliation with the author or the publisher.