Validation and Verification Standard v1.1

The Validation and Verification Standard sets the rules VVBs follow to validate projects, verify results and assess methodologies, including eligibility, materiality and performance review.

DocumentsLast reviewed 23 October 2026


Reference	CRI-STD-VVB-1.1/2025
Version	1.1 (version 1.0 approved 16 September 2021)
Date	Approved 24 September 2025; applies from 7 March 2026, with a one-year transition period
Applies to	VVBs and IVVEs; a reference for IPPs and IMDs
Download	Validation and Verification Standard v1.1 (PDF)

What it covers

Section	Topic	Read more
7	Auditing principles	What a VVB does
8	Empanelment of VVBs	Eligibility and empanelment
9	Independent VVB Experts for micro-scale projects	IVVEs
10 to 12	Materiality, level of assurance and techniques	Materiality
13	Performance review and categories	Performance
Part A (14 to 17)	Validation, clustering, external projects and PDCs	Validation
Part B (18 and 19)	Verification and renewal of crediting period	Monitoring and verification
Part C (20)	Assessment of methodologies and tools	Methodology assessment

Key numbers

At least reasonable assurance.
Materiality: ±5% up to 20,000 tCO2e, ±3% up to 100,000 tCO2e, ±1% above.
VVB categories: I (20 to 25), II (9 to 19), III (1 to 8).