Some clients provide a schedule or milestone dates with their tender documents which the contractor must comply with. However, in some cases the dates may be too optimistic and unachievable. It's therefore imperative that the contractor prepares their own schedule to ensure they can meet the stipulated dates. Should the contractor agree to dates they cannot meet they may find themselves incurring penalties because they completed the project late.
Preferably the contractor should resource their schedule so that they allow the costs for the resources required in their price. In addition they can ensure that they will have sufficient of the required resources for the project.