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.
Nese tempo, dous modelos programando do proxecto matemático foron desenvolvidos: (1) de 'Program Evaluation and Review Technique' ou o PERT, desenvolvido como a parte programa do mísil do submarino Polaris da mariña dos Estados Unidos' (conxuntamente con Lockheed Corporation); e o (2) 'Critical Path Method' (CPM) desenvolvido en conxunto por DuPont Corporation e Remington Rand Corporation para proxectos da mantemento de plantas.