Identify assumptions that can expire
Review assumptions tied to incomplete design, temporary quantities, preliminary schedules, supplier validity, access, work hours, permits, logistics, and pending scope decisions. State the source gap and the current cost treatment.
Avoid recording normal project facts as assumptions. Use the assumption register to retain the original basis and every later status change.
Set the decision date from project events
Tie review dates to drawing releases, addenda, quote expirations, design meetings, bid deadlines, or procurement milestones. A generic monthly reminder may arrive after the estimate decision is already locked. Assign one person to obtain the missing information or confirm continued use.
AACE guidance on the basis of estimate addresses documenting assumptions and estimate basis. The expiry review keeps that documentation current as the project develops.
| Field | Required detail |
|---|---|
| Assumption | Specific temporary basis |
| Trigger | Document or milestone |
| Treatment | Current estimate effect |
| Resolution | Owner, evidence, and approval |
Replace or approve the assumption
At review, close the assumption with a controlling document, revised takeoff, current quote, approved allowance, or explicit acceptance of remaining uncertainty. Record the estimate lines changed by the decision. Do not erase the earlier treatment.
Move unresolved high-impact items into the estimate risk register. The release report should show expired assumptions, current cost treatment, owner, and required approval.
