Time, cost and quality are the main criteria of the project that project managers to achieve success in projects, always seek to complete projects in the shortest possible time, at the lowest cost and with the highest quality. One of the main challenges in this case is choosing the right approach to achieve these goals. One of the most common approaches in this case is to use the balancing technique. In fact, by using this technique, the most optimal mode of project activities can be achieved, which leads to the least execution time, the lowest cost and the highest quality. . Project quality management includes all stages and parts of the project, including the initial definition of the project through project processes, project team management, deliverables, and project completion. Nowadays, the use of quality management systems has been proposed as a necessity to ensure the survival of organizations, and various researches and articles have been written in this field, but the establishment of this system in projects has been less discussed. In this article, while explaining the issue of quality time cost balance, quality management in projects is examined as one of the most important areas of project management knowledge, and then the concepts of quality costing regarding quality management in projects are examined. Is analyzed.