High Quality Content by WIKIPEDIA articles! This article covers the History of CP/CMS the historical context in which this important IBM time-sharing operating system was built. It provides details to support for the main CP/CMS and History of IBM articles, drawing on source material that is not readily available on-line. CP/CMS development occurred in a complex political and technical milieu. To study the system's history, it is necessary to examine these broader forces. The following material summarizes major issues and events of the day from the perspective of CP/CMS development a perspective that is somewhat different from (and orthogonal to) other ways of viewing the period. A key theme is the politics of a long running feud at IBM, between time-sharing and batch processing exponents.