The PERT chart was created in the 1950s to help manage the creation of US Navy weapons and defense programs. Although the PERT is being introduced into the Navy, the private sector has also triggered a similar approach called the "critical path."
In 1957, the NAvy special projects office created a PERT chart to assist Polaris nuclear submarine project.
Since then, it has found a home in a variety of industries, even the Winter Olympics in Grenoble in 1968.
The PERT in approaching the critical path came about the same time, developed from the scientific management created by Frederick Taylor, also known as Taylorism, which was later perfected by Henry Ford. But the use of the term critical path came from DuPont, who also developed the method in the late 1950s.
PERTs are similar to critical paths because they are used to visualize the timeline and the work that the project must do. However, with PERT, you can create three different time estimates for your project: estimating the minimum time each task will spend, the most likely amount of time, and the maximum time a task can take if things are not scheduled .
The PERT is calculated back from a fixed end date because the term of the contractor is generally not mobile.