When you need it
Use this log whenever planning or decisions depend on an unverified proposition or constraint, especially where later confirmation could change scope, cost, programme, technical choices, or the project's authority to proceed.
XLSX /
AI tools and documents for engineering and project management.
Project Assumption and Constraint Log
Track project assumptions and constraints, their evidence and the actions needed to verify or manage them.
How to use this templateThis Excel template contains prepared working sheets and completion notes on a separate sheet. Enter your project data and review the completed workbook before use.
The form prepares a separate brief; it does not fill the Word or Excel file.
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Only selected pages are shown. This is not the complete template. The full editable Word or Excel file is supplied with purchase.
Learning
How to use this template
What it helps you decide
It makes hidden dependencies visible and assigns validation responsibility, helping the team distinguish a convenient planning assumption from established evidence and revisit affected decisions when the underlying information changes or proves false.
How to complete it
- Assign ID and Type, describe Assumption / constraint precisely, and record Source / date so readers can understand the original basis and its currency.
- Identify Affected decision / work and Validation / management action, then assign Owner and Review date according to when the information could affect delivery.
- Update Status and Outcome / evidence after actual review, linking any resulting project decision rather than silently converting the assumption into an established fact.
Who prepares and reviews it
Project managers and discipline leads usually raise entries, with planners, estimators, commercial staff, and technical specialists contributing evidence. Assigned owners validate or manage each entry, while relevant decision authorities address resulting changes to approved commitments.
A mistake to avoid
Leaving assumptions in narrative notes without owners or review dates allows them to survive into later decisions as if someone had already verified them.
Illustrative example
Illustrative example: a plant concept assumes spare capacity in an existing electrical feeder. The log identifies the affected equipment decision and assigns the electrical lead to obtain confirmation. When the utility evidence shows insufficient capacity, the team revisits the connection concept before fixing the procurement package.
Document contents
- ID
- Type
- Assumption / constraint
- Source / date
- Affected decision / work
- Validation / management action
- Owner
- Review date
- Status
- Outcome / evidence
Required inputs
- Project name, location, company, document number and revision
- Actual project scope, source records and responsible roles
Practical tools.
Professional judgment.
Confirm the adopted edition, local amendments, National Annex where relevant, and contract requirements.
Prepare project brief