AIDAR (Agency for International Development Acquisition Regulation) is the primary acquisition regulation applicable internationally for the United States Agency for International Development (USAID). AIDAR provides consistent rules, regulations, and procedures that ensure government purchasers are held to the highest standards of accountability when procuring goods and services needed for international development projects. AIDAR contains guidance on topics such as contract formation, contract types, responsibility determinations, and cost monitoring in order to promote transparency, fairness, and value for money in procurement activities. This definition is directly derived from the Federal Register where AIDAR can be found.