The document discusses control of the supply chain for legally produced timber under the EU's FLEGT Action Plan. It outlines principles and criteria for ensuring traceability of timber from harvesting to export through mechanisms like wood tracing systems and chain of custody controls. Key requirements include clear delineation of forest resource rights, documentation and reconciliation of timber quantities at each stage of processing and transport, and controls to prevent mixing of legal timber with illegal or unknown sources. The system is designed to provide Partner Countries flexibility in implementation while achieving the goals of supply chain control and legality verification.