Estimation of project buffers in critical chain project management

Project management has been a mature research area using well entrenched methods like PERT/CPM to solve variant problems. The application of theory of constraints in the project management area results in the method of critical chain. Yet the critical chain approach is not perfect now, especially on the estimation of project buffers, This paper analyzes the different levels of uncertainty of activities for different types of projects, as well as management attitude towards risks; and proposes an enhanced method to improve the critical chain project management method