Could the Great Wall of China, the pyramids, or Stonehenge have been built without project management? It is possible to say that the concept of project management has been around since the beginning of history. It has enabled leaders to plan bold and massive projects and manage funding, materials, and labor within a designated time frame.
In late 19th century, in the United States, large-scale government projects were the impetus for making important decisions that became the basis for project management methodology such as the transcontinental railroad, which began construction in the 1860s. Suddenly, business leaders found themselves faced with the daunting task of organizing the manual labor of thousands of workers and the processing and assembly of unprecedented quantities of raw material.
Henry Gantt, studied in great detail the order of operations in work and is most famous for developing the Gantt chart in the 1910s. A Gantt chart (Figure 1.3 MindView Gantt Chart, by Matchware Inc (MindView) ) is a popular type of bar chart that illustrates a project schedule and has become a common technique for representing the phases and activities of a project so they can be understood by a wide audience.
Although now a common charting technique, Gantt charts were considered revolutionary at the time they were introduced. Gantt charts were employed on major infrastructure projects in the United States including the Hoover Dam and the interstate highway system and are still accepted today as important tools in project management.
By the mid-20th century, projects were managed on an ad hoc basis using mostly Gantt charts and informal techniques and tools. During that time, the Manhattan Project was initiated and its complexity was only possible because of project management methods. The Manhattan Project was the code name given to the Allied effort to develop the first nuclear weapons during World War II. It involved over 30 different project sites in the United States and Canada, and thousands of personnel from the United States, Canada, and the U.K. Born out of a small research program that began in 1939, the Manhattan Project would eventually employ 130,000 people, cost a total of nearly US$2 billion, and result in the creation of multiple production and research sites operated in secret. The project succeeded in developing and detonating three nuclear weapons in 1945.
The 1950s marked the beginning of the modern project management era. Two mathematical project-scheduling models were developed.
The program evaluation and review technique (PERT) was developed by Booz-Allen and Hamilton as part of the United States Navy’s Polaris missile submarine program. PERT is basically a method for analyzing the tasks involved in completing a project, especially the time needed to complete each task, the dependencies among tasks, and the minimum time needed to complete the total project (Figure 1.4 Pert Chart by Jeremykemp derivative work: Hazmat2 from Wikimedia Commons ).
The critical path method (CPM) was developed in a joint venture by DuPont Corporation and Remington Rand Corporation for managing plant maintenance projects. The critical path determines the float, or schedule flexibility, for each activity by calculating the earliest start date, earliest finish date, latest start date, and latest finish date for each activity. The critical path is generally the longest full path on the project. Any activity with a float time that equals zero is considered a critical path task. CPM can help you figure out how long your complex project will take to complete and which activities are critical, meaning they have to be done on time or else the whole project will take longer. These mathematical techniques quickly spread into many private enterprises.
Project management in its present form began to take root a few decades ago. In the early 1960s, industrial and business organizations began to understand the benefits of organizing work around projects. They understood the critical need to communicate and integrate work across multiple departments and professions.
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