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Definition: Change requests may occur in many forms—oral or written, direct or indirect, externally or internally initiated, and legally mandated or optional. Changes may require extending the schedule or may allow accelerating it.

Acceptance Level:  Generally accepted

Alternative or Related Terms: Change requests, cost change requests, scope change requests, procurement change requests

Application Areas/Intended Uses: Schedule change requests are an input into schedule control.

Chief Advantages: Schedule change requests provide a formalized mechanism for processing proposed changes affecting the project schedule.