What level of schedule is a good practice for Tender or Proposal Schedules? I have been requested to develop a tender/proposal schedule for a bid and they are asking me to include customer milestones and the activities that are linked to these milestones (activities from the engineering, procurement and construction phases). To me this would be like developing a Level 3 Schedule. I think tender or proposal schedules are developed at a Level 1 or Level 2 (executive level; not much detail); once the contract is awarded, then a Level 3 Schedule can be developed. Subcontractor companies that execute construction works develop a Level 4 Schedule. Am I right or wrong?