Site problems Integrated Master Plan (IMP) An Integrated Master Plan (IMP) is an event-driven plan that documents the significant accomplishments necessary to complete the work and ties each accomplishment to a key program event milestone (such as a design review or major test), for each major entry in the Work Breakdown Structure (WBS). An IMP is an overall program structure and organization tool for monitoring the progress of a program. IMPs can be sorted by the work to be completed for each event and then by WBS (to show the work to be completed for each WBS). The IMP is the foundation for the Integrated Master Schedule (IMS). The IMP and IMS should clearly demonstrate that the program is structured and executable within schedule and cost constraints and with an acceptable level of risk. Thus, both the IMP and IMS are key in program planning, proposal preparation, source selection, and program execution. IMP/IMS Preparation Guide  The IMP is an event-driven plan for executing the program and represents the hierarchical structure of the program activities.