The origins of CPM
a personal history
The critical path method (CPM) evolved from corporate management's proactive search to develop better ways of operating business activities. This article--authored by the individuals whose work and writing in the 1950s launched CPM--explains the evolution of CPM from its beginnings in December 1956 to its present day form. In doing so, it discusses how CPM emerged from work on an exploratory scheduling project spearheaded by E. I. duPont de Nemours (Newark, Delaware, USA)--Mr. Walker's employer;and how this initiative was realized through a joint effort involving duPont and Remington Rand Univac (Philadelphia, PA, USA), Mr. Kelley's employer. It outlines problems the developers solved and their problem-solving techniques. It describes how CPM was developed to resolve the concerns and problems of scheduling and implementing engineering and construction projects. Accompanying this article is a three-page article written by the duPont engineering manager who led the joint effort, an article that discusses the beginnings of the CPM project, identifies the project's objectives, and explains the process for first testing CPM.