The diagnosis and treatment of GH deficiency (GHD) during childhood and adolescence have been the subject of much controversy (1–3). To insure that patients are appropriately identified and treated, the GH Research Society (GRS) convened a workshop, on October 17–21 1999, in Eilat, Israel. The objectives of this workshop were to formulate consensus guidelines for the diagnosis and treatment of children and adolescents with GHD. The GRS invited clinicians and scientists with expertise in the field, representatives from industries involved in the manufacturing of recombinant GH, and representatives from health authorities from a number of countries to attend the workshop. All of them contributed to the consensus guidelines as detailed below.