On behalf of UNIDO and in cooperation with the National Cleaner Production Center and the Ministry of Trade and Industry in Cambodia, STENUM conducted a six-day training course on resource efficiency in industrial companies. The aim of the training was to increase resource efficiency in Cambodian companies by implementing measures to reduce waste and sewage, to improve chemical management and to reduce CO2 emissions in the long term. During the training the concepts were discussed, practical exercises for the identification of optimization measures were carried out and two companies audited on site.