Project Management guide · Planning and scope
Integrated Master Plan (IMP) and Integrated Master Schedule (IMS)
An integrated master plan (IMP) is an event-based plan used in large, complex programmes, especially in defence and aerospace. It defines the major events, the accomplishments required for each, and the criteria that show they are complete.
Key takeaways
- An IMP defines events, accomplishments and criteria.
- The IMS schedules the tasks behind them.
- Used in large defence and government programmes.
Structure of an IMP
| Level | Meaning | Example |
|---|---|---|
| Event | A major programme milestone or review | Preliminary design review |
| Significant accomplishment | A result needed for the event | System architecture defined |
| Accomplishment criteria | Evidence the accomplishment is complete | Architecture document approved |
IMP vs IMS
| Integrated master plan | Integrated master schedule | |
|---|---|---|
| Basis | Events and accomplishments | Time-based tasks |
| Detail | What must be achieved | When tasks happen, with dependencies |
| Link | Defines the structure | Schedules the work behind it |
When it is used
- Large government and defence contracts.
- Programmes with many contractors.
- Projects requiring earned value management.
- Complex engineering programmes.
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Frequently asked questions
What is an IMP?
An event-based plan defining events, accomplishments and completion criteria.
What is an IMS?
A detailed, time-based schedule of tasks supporting the IMP.
Where are IMPs used?
Mainly in defence, aerospace and large government programmes.
Is an IMP the same as a project plan?
It is a specific form of high-level programme plan focused on events and criteria.
Does an IMP include dates?
Events may have target dates, but detailed timing lives in the IMS.
How does an IMP relate to the WBS?
Accomplishments and tasks map to WBS elements.
Who prepares the IMP?
Usually the contractor, reviewed by the customer.
Is an IMP used with earned value?
Yes, often together with EVM for performance measurement.
What are accomplishment criteria in an IMP?
Objective evidence that an accomplishment is complete.
Is an IMP needed for small projects?
No. It is designed for large, complex programmes.