41 U.S.C. § 109 — Major system

(a) In general. In this subtitle, a "major system" means a combination of elements — hardware, equipment, software, or some mix of them — that work together to give the government the capabilities it needs for a mission. This definition does not include construction or other improvements to real property. (b) System deemed to be a major system. A system counts as a "major system" if any one of three things is true: (1) the Department of Defense is responsible for it, and its estimated research, development, testing, and evaluation costs exceed $75,000,000, or its eventual total procurement cost exceeds $300,000,000 — both figures measured in fiscal year 1980 dollars; (2) a civilian agency is responsible for it, and its estimated total costs exceed whichever is greater: $750,000 in fiscal year 1980 dollars, or the dollar threshold that agency has set for a "major system" under OMB Circular A-109, called "Major Systems Acquisitions"; or (3) the head of the responsible agency simply designates the system a major system.