A network of interlaboratory collaborations involving approximately 270 scientists and clinicians from more than 100 institutions was set up in the area of clinical hyperthermia. Main objective was the improvement of technology related to hyperthermia treatment and stimulate a concerted clinical action on a european level. Areas of research covered electromagnetic and ultrasound heating, invasive and non-invasive thermometry, modelling and treatment planning, guidelines for quality assurance. We report on the results and the prospects of the network on the period July 1989 - September 1992 covered by CEC contracts MR*4/0204/B and 1VLR*4/0306/B.