Going off of what srg36 said in response to moniquet07, I think the project scheduling would need a “Clarification” or a “Agreement” step. This way all parties know what they are up against, and if something is not correct (either time wise or design wise), the PM can make adjustments. And with any schedule, you I also think it should include the “execution” phase where the project actually begins production and “updates” where they make sure they are on track with their predicted schedule.