Using the Ward Atmosphere Scale, we reassessed the ward atmosphere of a psychosomatic unit for children and adolescents that has been operating successfully for 10 years. There was remarkable stability in essential treatment program characteristics despite the complete turnover in patients and a 60% turnover in staff. There was substantial correlation between patient and staff perceptions in 1988 and across time (Spearman's rho: 0.951-0.660, all p values < 0.05). Patients and staff subgroups differed somewhat in their relative emphases on certain program dimensions but, overall, the program still correlated highly with the therapeutic community cluster described by Moos (Spearman's rho: 0.660-0.809, all p values < 0.05). This stability was achieved despite multiple health care changes, most notably shortened length of stay. Stability was probably due to high staff/patient ratio, continuity of the medical direction, and focus on milieu maintenance in staff meetings.