Business Process Mapping may sound like a good idea. However, note that mapping business processes with the input of internal departments is merely collecting one viewpoint (internal employees). We may miss the viewpoint of our customers, suppliers, regulators, auditors, members, ex-employees, partners, and contractors. By including their viewpoints, we may have a more complete 360-degree view of the enterprise. That is not enough, however. We may also want to consider gaining the viewpoint of focus groups, competitors, industry research, and the future direction of our industry.
It may sound too much for the business process mapping project. Not including all of the above in your project scope is okay. But, be aware that the mapping process with the internal staff is merely a part of the overall picture!