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Documenting Assumptions

Well-documented assumptions are the foundation of a credible forecast. Each overlay in Galdera represents one assumption — and its canvas is the right place to capture everything a reviewer needs to evaluate that assumption.

Best practices for documenting overlay assumptions:

  • Be specific about the source: "Based on signed contract" is stronger than "Based on sales estimate"
  • State the key dependencies: "This assumes the product launches in Q3 as scheduled"
  • Note the review trigger: "Revisit if churn rate exceeds 8% in Q2"
  • Capture the date of the assumption: Business conditions change; knowing when the assumption was made matters

The canvas documentation on a Forecast Version records what was believed at the time of the forecast, creating an auditable trail that boards and auditors can review. Keep past versions' canvases untouched once a planning cycle closes so that record stays meaningful.