A controversy with a more than 35 year life has finally been addressed by the US Court of Appeals for the Federal Circuit – and in a pro-contractor fashion. In its March 19, 2010 decision in ATK Thiokol, Inc. vs. United States, Fed. Cir. No. 2009-5036 (3/19/10), the Court of Appeals, in affirming the Court of Federal Claims decision from 2005, determined that research and development costs not specifically required by a contract may be treated as Independent Research and Development ("IR&D") under FAR 31.205-18. While this might seem a fairly unremarkable holding, and one consistent with reason, sound procurement policy, and a harmonious reading of the relevant regulations, the Government has for years taken the contrary view that costs of implicitly required development cannot be treated as IR&D. And, as a result, those contractors who treated such costs as IR&D have been treated to cost disallowances, citations for CAS non-compliance, and even accusations of fraud.