Spacing OutOops! Forgot to include something crucial in your business plan? So did these entrepreneurs.

Are you sure your well-thought-out business plan covers all the bases? As these entrepreneurs learned the hard way, something vital could be missing. Here's what they forgot-and what they learned from their mistakes.

• "We forgot to plan for the obvious, like who would watch our kids and clean our houses while we worked 18-hour days. And we should have included a chapter in our business plan about the effects of sleep deprivation on wholesome snack production. These are things you think you'll just figure out as you go but should really be discussed in the planning stages."

-Lisa Coates, 35, who launchedMonkey Muffins, a Nyack, New York, maker of wholesome children's snacks, with partner Robin Rarrick, 42