Up to this point, the only time constraints put on the project are based on expectations and broad estimates.  In predictive project management, the practical realities of the plan are now entered into a formalized project planning system. What work can be done independently and what work relies on task completion by other members? Where do milestones lie on the calendar when based on completion of tasks? What is the critical path and how can you make adjustments?  The advantages to using software involve the ability to use it organically as a tool to negotiate with stakeholders through ‘what if’ planning steps.