ISO 14064 - Greenhouse Gas Accounting and Verification (Parts 1-3) 1:8.3: 8.3 Assessing uncertainty

What does 1:8.3 require?

Uncertainty in the organization's quantification approaches (both data and models) shall be assessed, and uncertainty determined for each inventory category. Where a quantitative estimate is impossible or not cost-effective, the organization must justify this and carry out a qualitative assessment instead (ISO/IEC Guide 98-3 may be used).