Anything added to a business plan needs to make business sense.
A corporate business plan for a large organization can be hundreds of pages long.
However, for a small business, it's best to keep the plan short and concise, especially if you intend to submit it to bankers or investors.
The stress these days is not the volume of such a plan but whether or not it is easy to read and comprehend.
The review section is the most important in a business plan because in this part parties acknowledge to discuss any progress or pitfalls the business may have experienced.