TNFD Value Chain Assessment: Suppliers, Commodities, Traceability and Data Gaps

Educational practitioner guidance. Not legal, scientific-validation or assurance advice. Apply TNFD to the organisation's facts, stated materiality approach, ecological context and reporting basis.

Important nature interfaces often sit in raw-material production or downstream use rather than with the direct contractual supplier. Waiting for complete tier-by-tier coordinates can leave the highest-exposure commodities outside the assessment. TNFD value-chain guidance supports a proportionate mix of primary and secondary information, provided scope, uncertainty and improvement actions are visible.

Proportionality is not permission to ignore difficult chains. The organisation should explain how stages were selected, why some received deeper work, what evidence quality was available and how unknown or proxy origins will improve.

Link the span to business models, product families, revenue and procurement categories rather than only the supplier master. This prevents direct-tier data from obscuring farms, fisheries, mines, forests or processors where the physical interface occurs.

A phased assessment moves from the full span to screening, prioritisation, traceability and supplier engagement. Spend or volume is one input, not a measure of impact or dependency.

The counterparty may be a trader, distributor or group procurement hub rather than the producer. Separate direct supplier, physical processor, primary production interface, trader/aggregator and origin evidence. A trader address is not a farm, mine or fishery origin.

Direct supplier — contractual counterparty.

Processor — facility transforming or aggregating the product.

Primary production interface — farm, forest, fishery, mine or extraction area.

Trader/aggregator — intermediary with a stated physical, mass-balance, credit or book-and-claim model.

Origin evidence — document, declaration, batch link, district, polygon or proxy supporting location.

If the chain cannot be resolved, retain the intermediary and the unknown upstream stage. Removing it creates a scope gap; assigning a precise origin without evidence creates false traceability.

Record scheme, version, holder, site/chain scope, validity, traceability model, volume coverage, assurance status and limitations. Do not translate “certified” automatically into “low impact”, “not sensitive” or “TNFD aligned”.

Traceability can improve from unknown through proxies, supplier declarations and documented chains to verified locations. Every record retains date, geography, confidence, assumptions and an improvement action.

Preserve prior grades and change history so improvements in coverage and precision can be explained.

Downstream interfaces matter where products require water or energy, release nutrients or chemicals, enable land-use change, affect species, or create waste and leakage. Start with product archetypes, use scenarios, markets and disposal pathways, then deepen work where pathways may be important.

Requests should be proportionate to role and exposure. Where leverage is limited, sector collaboration, landscape initiatives or public data may work better than repeated bilateral questionnaires.

1. Define the span. Map business models, products, sectors, commodities and stages.

2. Create the population. Link suppliers, processors, traders, routes, markets and end-of-life pathways.

3. Run broad screening. Identify likely dependency and impact pathways.

4. Add business and geography. Combine volume/spend, concentration, origin, sensitivity and uncertainty.

5. Prioritise deeper work. Document why interfaces enter the next phase.

6. Grade traceability. Classify verified, documented, declared, proxy and unknown.

7. Build location/pathway evidence. Collect coordinates, practices, controls and outcomes proportionately.

8. Engage and correct. Resolve inconsistencies and agree milestones.

9. Integrate findings. Pass relevant pathways to Evaluate and Assess.

10. Report coverage and limitations. Explain scope, proxies/unknowns, actions and change over time.

The group uses commodity and country screening to identify likely water and land pathways, prioritises mills and agents by volume, uncertainty and leverage, and requests sourcing-region and chain evidence. Verified polygons receive detailed assessment; declared districts receive subnational screening; proxy and unknown volumes stay visible. The programme tracks volume by traceability grade and supplier milestones.