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Assumption log

Which beliefs underpin a plan, how will they be tested, and what happens if they fail?

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Start with a clear working structure.

The assumption log turns a recurring piece of work into a record that another person can understand and continue. The working view makes assumption, importance, and evidence visible so discussion can move from general opinion to a specific action or decision.

Assumption logGuided working template
Step 1Context and intent

Write a falsifiable statement, current confidence, supporting evidence, test method, owner, and date by which it must be resolved. Use the agreed scale, justify the rating from evidence, and state what would move it at the next review. Complete the remaining items so this section is ready for review and use.

Step 2Assessment and design

Use the agreed scale, justify the rating from evidence, and state what would move it at the next review. Define the standard before judging the work, and make each criterion specific enough for two reviewers to apply consistently. Complete the remaining items so this section is ready for review and use.

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