Assumptions and other facts that we gather about the project can help us limit the scope of the project. Remember, we do not have enough time, money or people to solve a problem with a very large scope. For instance, we could not hope to design and build a human powered helicopter in one semester. However, we might be able to design the gearbox necessary for the helicopter. The project team and the project sponsor must agree upon the scope of the project. If this agreement is not reached early in the project disagreements can cause long project delays.