What is the purpose of the Assumption Log?

• A. To document and track project assumptions and constraints.
• B. To log all project risks.
• C. To record approval decisions.
• D. To track stakeholder communications.

Answer: (A)

The Assumption Log is the living record of what the team takes to be true for planning, including the assumptions and the constraints that shape the project. It documents each assumption, who owns it, when it was identified, its potential impact, related constraints, probability or confidence, and its current status. This keeps planning grounded in what is believed to be true, and it lets the team monitor whether an assumption remains valid as work progresses. When an assumption proves false or becomes uncertain, the log helps trigger updates to the plan or to risk management, ensuring plans stay realistic and aligned with reality.

Other artifacts serve different purposes: the risk register logs threats and opportunities; a decisions log records approvals; and a communications log tracks stakeholder messages. But the Assumption Log is specifically about documenting and tracking assumptions and their constraints.