Knowledge of the critical path and the degree of criticality and sensitivity of the task time is a specific problem requiring further research. Until now, there is no specific procedure to resolve resource contentions and general optimisation method due to its complexity. The major result the researcher presents in this book is a revision of the critical chain project scheduling process model through simulation. The theory of optimisation for projects (TOP) methodology integrates different heterogeneous scenarios data sources to reduce the risk of the expected project time. As a result of the proposed novel TOP, delays are less likely when managing highly uncertain tasks. The methodology will provide a unique, integrated and placid source of information. It may provide a complete view of heterogeneous critical task activities. Accurate information for project managers helps them to make decisions. They are also able to validate the time sensitivity of the task time on the expected project time using the sizing rule integrator for measuring time sensitivity dimension. Project managers may now be aided to resolve resource contentions.