By defining project assumptions from the start, you can detail any external events or externally supplieditems on which the project depends. This way, should factors outside the project have a negative impacton the work, your client will be prepared for it.
Your project management plan can also include a section defining how the project will be organized,including interfaces with external entities and within the organization itself. Clearly defining allstakeholders’ roles and responsibilities can go a long way toward preventing communicationbreakdowns later.