The article shows the relationship between various theories of constraints in project management and theories of constraints in general management (TOC). Constraints are the restraining factors of the project, with which all project managers and project offices must work on the way to achieving project goals. Each project is unique and has limitations that consist of the specifics of the industry, a specific enterprise, and the project. The project manager and the project office need to identify the most influential constraint, or several constraints, that reduce the performance of the entire system. That is, it is necessary to identify and eliminate restrictions that primarily affect the entire portfolio of projects. The theory of constraints makes it possible to determine exactly where in the process of project implementation there is a bottleneck that reduces the productivity of project implementation. The elimination of bottlenecks and the optimization of processes lead to an increase in the efficiency of project execution and the project portfolio as a whole. This makes it possible to obtain better project results at lower costs of limited resources by improving the quality of project management by the project management office.
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