Impact Is Not Confidence

The danger of one number

Sustainability assessments often present a calculated outcome without making the evidence structure visible. A result may combine measurements, derived values, industry benchmarks, supplier claims and assumptions, yet appear as one equally certain figure.

SDAF separates the magnitude of the outcome from confidence in the evidence supporting it. Confidence can qualify or reduce reliance on a result; it must not make the result look better.

A calculation answers “what might the impact be?” Confidence answers “how strongly can we rely on that conclusion?”

What should remain visible

• Whether an input is actual, derived, benchmarked, assumed or missing.
• Whether it applies to the functional unit and assessment boundary.
• The uncertainty range and sensitivity of the recommendation.
• Which conclusions change when material assumptions change.

Governance consequence

Low-confidence evidence may still be useful for screening or identifying where better data is needed. It should not be silently treated as decision-grade proof. Where required evidence is missing or confidence falls below the conformant threshold, the honest outcome may be inconclusive.

This protects the decision from false precision and protects sustainability claims from being stronger than their supporting evidence.