THE DEFINITIVE GUIDE FOR FEDERAL CONTRACT PROFESSIONALS. This is the first of its kind how-to book for Federal Contract Professionals. It provides a detailed explanation of the 110 NIST 800-171 controls and how to best determine their completeness. The book explains and anticipates the pending expansion of NIST 800-171 and FAR Clause 52.204-21 to the entirety of the federal government. Be prepared. For Contract Officers, Contract Specialists, and Consultants to help contracting work through the challenges of NIST 800-171.