This manual lays down the procedures for the identification and scaling of natural forest logs in Papua New Guinea and the associated reporting requirements, in order to inform licensed log scalers, PNGFA Project Supervisors, and Timber Permit/Authority Holders and their contractors. To this end, this manual sets out the responsibility for scaling, log identification and scaling method, recording of information by the scaler, control by the provincial forestry officers including log scaling record sheets, declaration of logs harvested and royalty self-assessment, and scaling checks by the PNGFA Project Supervisors. Furthermore, codes for PNG commercial tree species and formulas for calculating log volumes are annexed to this manual.