At that time, two mathematical project-scheduling models were developed.

At that time, two mathematical project scheduling models were developed: ( 1 ) the " Program Evaluation and Review Technique " or PERT, developed as part of the United States Navy's ( in conjunction with the Lockheed Corporation ) Polaris missile submarine program ; and ( 2 ) the " Critical Path Method " ( CPM ) developed in a joint venture by both DuPont Corporation and Remington Rand Corporation for managing plant maintenance projects.

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