A Practice Note providing an overview of the relevant laws and regulations of acquisition flexibilities for federal agencies when contracting for supplies or services during certain circumstances (Federal Acquisition Regulation 18.2). This note discusses the specific circumstances including contingency operations, defense against or recovery from cyber, nuclear, biological, chemical, or radiological events, international disaster assistance, or a response to an emergency or major disaster. The available flexibilities to federal agencies raise the threshold levels for simplified, micropurchase, and test program commercial products or service acquisitions, as well as providing other specific measures.