We divide projects into stages so that we can conduct the work in manageable pieces. By working in stages, we create a series of opportunities where those accountable for steering the project, such as the Project Sponsor or Steering Group, must check two important matters. The first is to ensure that work from a previous stage has been satisfactorily completed. The second is to verify that the justification for the project is still valid and that the plans and budgets for the next stage and for the remainder of the project are complete, clear and realistic.