Managing project time is one of the major tasks that a project manager must undertake. On time is one of the keys to project success. A Gantt chart is a graphical representation of the project’s schedule. The information is identical to that of a network diagram: the tasks and their duration, sequence, and dependencies. A government hearing or Food and Drug Administration drug testing prior to release are examples of external dependencies. They must, however, be considered as they can have a delaying influence on the project. Lessons learned is specific project documentation. It can take the form of an action item register. An action item register is a formal mechanism for recording issues that arise during project execution. There are three types of dependencies to be considered: mandatory, discretionary, and external. Mandatory dependencies are, as the name suggests, those dependencies that are inherent in the work.