Here is a general guideline to help get you started on the sale of your business.  If you need ideas for more internal structure, we can help with that too.
Dun &Bradstreet Rating Classification
The D&B Rating System is a widely used tool that uses a two-part code to represent a firm's size and composite credit appraisal.  A Rating may be based on Worth from an interim or Fiscal Balance Sheet, or on the Number of Employees. 
"5A" To "HH"  Ratings reflect company size based on net worth or equity as computed by  D&B.  These Ratings are assigned to businesses that have supplied D&B with a current financial statement.
In "5A" to "HH" Ratings, the Composite Credit Appraisal is a number , 1 through 4, that makes up the second half of the company's Rating and reflects D&B's overall assessment of that Firm's creditworthiness.  This assessment is based on both payments and financial stability.
"1R" and "2R" Ratings reflect company size based on the total number of employees or the business.  They are assigned to business files that do not contain a current financial statement.
In "1R" and "2R" Ratings, the "2" , "3", or "4" Composite Credit Appraisal is based on an analysis by D&B of trade payments, public records, business age and other important factors.  A "2" is the highest Composite Credit Appraisal a company not supplying D&B with current financial information can receive.