When submitting my concepts to invention hunts, licensing agents, manufacturers, retailers, engineers, and the patent office, I was asked many different kinds of questions. The questions ranged from "What problem does it solve?" to questions that required extensive research such as "Who is your target market?"
The invention process involves disclosing your invention to a wide variety of readers. As mentioned, such document is a starting point or template for providing future material with respect to the many different readers and audience for which you will need to communicate your invention.
Sometimes it takes a significant event or change in existing conditions for a business to create a written plan. I think it's safe to say that the state of the economy is a significant change that should prompt business owners to alter the way they've been doing things. If you already have a business plan, it's time to get it out and revise it.
When there exists a broad belief that spending beyond necessity is unwise, people will change their habits and as a result, some businesses will have to close their doors. The economy is molting into a new, leaner animal. Rather than react in desperation to avoid doom, firms should interact with the current situation with innovative and forward thinking actions.