Site problems Integrated Master Schedule (IMS) The IMS is an integrated, networked schedule containing all the detailed discrete work packages and planning packages (or lower level tasks or activities) necessary to support the events, accomplishments, and criteria of the Integrated Master Plan (IMP) (if applicable). The IMP events, accomplishments, and criteria are duplicated in the IMS. Detailed tasks are added to depict the steps required to satisfy criterion. The IMS should be directly traceable to the IMP and should include all the elements associated with development, production or modification, and delivery of the total product and program high level plan. Durations are entered for each discrete work package and planning package (or lower level task or activity), along with  predecessor and successor relationships, and any constraints that control the start or finish of each work package (or lower level task or activity). The result is a fully networked “bottoms Up” schedule that supports critical path analysis. It should be noted that although durations are assigned at the work package and planning package level, these durations will roll-up to show the overall duration of any event, accomplishment, or criterion. When Level of Effort (LOE) work packages, tasks, or activities are included in the IMS, they must be clearly defined. LOE “never” drives the critical path(s). IMP/IMS Prep Guide IMS Highlights • Calendar based to track progression • IMS tasks are a breakout of required effort for each IMP event • Used during program execution to track schedule and support risk management activities • Network schedule shows interrelationships and critical path