While business agility and adaptability are sometimes valued more than traditional business planning these days, don't be fooled. Business planning is just as important but it can also be done much more simply than many existing and aspiring business owners realize. Palo Alto Software founder and "Lean Business Planning" author Tim Berry explains why you need a business plan, what it needs to include, why it doesn't have to take a long time to put together, and how to use it to make your life easier.