As a subcontractor, you need to appreciate that the subcontract you (more than likely) sign is going to have you bear risk associated with furnishing manpower to maintain the prime contractor’s schedule and progress. A subcontractor can factor some of this risk into the lump sum amount it agrees to in the subcontract. But, from the general/prime contractor’s perspective, it is very important that this risk is borne by the subcontractor because there is no such thing as a schedule written in stone. The baseline schedule, whether attached to the subcontract or not, will change. Activities will be re-sequenced. Activities will be added. Activities will overlap. Activity start dates and finish dates will change. It is the nature of construction. As a subcontractor, you know all of this because it is the same no matter the project. Schedules are never written in stone — they change on a regular basis.