In the frame of the JOULE 1 R&D programme of the Commission of the European Communities this project has been carried out on enhanced evaporation heat transfer surfaces. The main goal of the project was to develop and investigate enhanced evaporation heat transfer surfaces for industrial compact two-phase heat exchangers. Planar and tubular surfaces have been investigated by IKE (structured planar and tubular surfaces), GRETh (covered planar surfaces) and NEL (covered tubular surfaces).