It takes the core ideas out of your head and puts them on paper in specific terms. This is often the most scrutinized part of the plan. Consultants may spend lots of time getting the official numbers and presenting them accurately. Consultants often spend a great deal of time answering these questions in a concise, interesting fashion. You and the consultant must carefully work to explain the race being run.
People looking at a business plan want to know how a business plans to achieve results.
Consultants can help make this clear. Give the consultants all your information and let them rip you to shreds. Ask for harsh criticism. It's better to hear it from them than your bankers. See if they are clear, concise and well written.