Critical Chain Project Management (CCPM) is a project management method based on the Theory of Constraints (ToC), which tries to avoid harmful multitasking, i.e. WiP (Work in Progress) is kept as low as possible and in a multi-project environment all projects are staggered in such a way that the previously identified bottleneck of the overall system is optimally utilized. A special feature of CCPM is buffer management, which is based on the so-called critical chain - please do not confuse it with the critical path! Buffers are much smaller than in classic project management and are located as a large block at the end of a project or as smaller blocks before the respective assignments of the bottleneck resource, so that this resource never has to wait with the start of its work and is optimally utilized. In this way, a high degree of adherence to schedules is achieved, allegedly 95% despite a 25% reduction in project duration. CCPM is similar to Scrum in its basic principles, which is why these methods can be easily combined. Source: Alexander Kriegisch, Scrum-Master.de See also: Wikipedia - CCPM "Scrum and CCPM - two successful models with common roots".