In East Kalimantan (Indonesia), effects of logging were investigated both in terms of commercial timber volume extracted and impact on the residual stand. Two logging techniques, conventional and Reduce Impact Logging (RIL), were compared on the basis of pre- and post-harvesting stand inventories. Timber volume extracted averaged 87 m3/ha and the resulting commercial volume was 46 m3/ha . On average, logging damage affected 40% of the trees (dbh > 10 cm), injured and dead trees were recorded in equivalent proportions (21 % and 19% respectively). Generally, felling resulted in tree injuries especially, crown damage, whereas skidding killed trees, usually by uprooting. Damage from RIL was significantly lower (30.5 % of affected trees) than from conventional methods (48.1 %). This study demonstrated that the impact of logging on trees can be substantially reduced by strict supervision and planning of logging operations and, limit of harvesting intensity, which should not exceed 6 to 7 stems/ha (ie commercial volume < 35 m3/ha) . If these technical recommendations are followed, it is possible to reduce logging damage by 20% equivalent to maintaining about 100 stems/ha (dbh > 10 cm) undamaged by logging.