Written notification to the Congress and the Comptroller General of the United States (if the basis of the waiver is excessive cost) when the Milestone Decision Authority (MDA) decides to waive the competitive prototyping requirement at or prior to Milestone A for a Major Defense Acquisition Program (MDAP). The letter typically summarizes what the program is developing and the cost benefit analysis provided by the Military Department that supports the MDA's decision to waive the competitive prototyping requirement.