Requests Log and Assumptions: Change Log and Assumption Log in

PMBOK v8 Definition

The change log is a comprehensive list of changes submitted during the project, which includes the current status of the submitted changes. The disposition of all change requests is recorded in the change log as a project document update. The assumption log is a project document used to record all assumptions and constraints throughout the project. New assumptions and constraints may be added, and the status of existing assumptions and constraints may be updated or closed out.

Why It Matters for the Exam

This concept appears frequently in PMI exam questions testing your ability to distinguish between project documents and their specific purposes. Expect scenario-based questions where you must identify which log (change log vs. assumption log) is updated in a given situation, or which document records the disposition of change requests.

Key Points to Remember (for the exam)

Change Log Definition: A comprehensive list of ALL changes submitted during the project, including current status of each change
Assumption Log Definition: Records ALL assumptions AND constraints throughout the project lifecycle
Disposition Recording: The disposition of ALL change requests is recorded in the change log as a project document update
Approved Changes: Result from change requests fully approved through change control review meetings, either by the project manager or change control board (CCB)
Assumption Log Updates: New assumptions and constraints may be added; existing ones may be updated or closed out
Common Confusion: The change log records dispositions (approved, deferred, rejected), NOT just approved changes
Key Distinction: Change log = change requests; Assumption log = assumptions + constraints

Typical PMI Exam Example

A stakeholder submits a change request to modify the project scope. The project manager reviews it and determines it requires CCB approval. After the CCB meeting, the request is rejected. Where should the project manager record this disposition? Answer: The change log, as a project document update.

PMI Exam Traps

Trap: Confusing the change log with the assumption log
- Reality: Change log records change request dispositions; assumption log records assumptions and constraints
Trap: Thinking only approved changes are recorded in the change log
- Reality: ALL dispositions (approved, deferred, rejected) are recorded in the change log
Trap: Assuming the project manager always approves changes
- Reality: Changes can be approved by the project manager OR change control board (CCB), depending on authority defined in the change management plan
Trap: Confusing "change log" with "change management plan"
- Reality: Change log is a project document; change management plan is a component of the project management plan

Important PMI Connections

Related Concept	Relationship Type	Exam Attention Point
Change Requests	Input to change log	All change requests (approved, deferred, rejected) have their disposition recorded in the change log
Change Management Plan	Directs the process	Documents CCB roles, responsibilities, and authority for approving changes
Approved Change Requests	Output of change control	Implemented via the Manage Project Execution process
Assumption Log	Separate project document	Records assumptions AND constraints; updates/closure of existing items

Quick Review Questions

A change request is rejected by the CCB. In which project document should this disposition be recorded?
During project execution, a new constraint is identified. Which project document should be updated?
What is the difference between an approved change request and an approved change?
Who can approve change requests according to the change management plan?
What happens to deferred or rejected change requests after their disposition is recorded?

PMBOK v8 Reference

Section 2.4.5 - Project Documents (Change Log and Assumption Log)
Section 4.6.3 - Perform Integrated Change Control (Change Requests and Approved Changes)