The Department of Defense (DoD) must continue to improve product support, with a specific focus on increasing readiness and enabling better cost control. In 2008, the Office of the Assistant Secretary of Defense for Logistics and Materiel Readiness (ASD(L&MR)) established a group of senior government, industry, and academia representation called the Product Support Assessment Team (PSAT) to drive this effort. In November 2009, Dr. Ashton Carter, Under Secretary of Defense for Acquisition, Techlogy, and Logistics (USD(AT&L)), approved and signed the Weapon Systems Acquisition Reform Product Support Assessment (WSAR-PSA) report and its eight integrated recommendations to improve life cycle product support decision making process. In addition to the PSAT effort, this DoD Product Support Business Case Analysis BCA Guidebook supports Dr. Carter's November 2010 memorandum on Better Buying Power by laying out a uniform methodology for accurate, consistent, and effective support of value-based decision making, while better aligning the acquisition and life cycle product support processes. This guidebook fulfills the need to standardize the DoD BCA process used to conduct analysis of costs, benefits, and risks. A senior team of system engineers, logisticians, acquisition experts, and financial experts from the Services, Agencies, Industry, and Academia embedded their broad kwledge and experience into this guidebook to help BCA practitioners serve their primary customers, the Warfighter and the Taxpayer. This guidebook provides overall guidance for conducting a Product Support BCA. This guidebook should be used in conjunction with other analytical tools and guidance and can be further tailored for specific types of BCAs.