Systems analysis was first proposed and used by the RAND Corporation in the United States before and after the end of World War II. In 1945, the U.S. Douglas Aircraft Company organized scientific and technological experts in various disciplines to study the problem of intercontinental warfare for the U.S. Air Force in order to provide the Air Force with recommendations on technology and equipment, which was then called the "Research and Development" (R & D) program. At that time, it was called "Research and Development" (Research and Development, abbreviated as R & D) program. In May 1948, the implementation of the program's departments from the Douglas Corporation independent of the establishment of the RAND Corporation, "RAND" (RAND) is the name of the company. "RAND is an acronym for Research and Development.
In the 30 years from the late 1940s to the 1970s, systems analysis developed rapidly along two distinctly different lines. One route was the use of mathematical tools and economic principles to analyze and study new defense weapon systems. in the early 1960s, U.S. Secretary of Defense McNamara applied this methodology to the entire military, and soon spread it throughout the government, resulting in the famous "Program-Planning-Budget System" (PPBS). " (PPBS) approach. Driven by the military and government departments, U.S. civilian businesses have also begun to apply systems analysis methods to improve the efficiency and effectiveness of transportation, communications, computers, and public **** health facilities; in the areas of firefighting, medical care, power grids, navigation, and other areas, systems analysis methods have also been widely used.