The study evaluated the effects of an organisational change programme on quality of care in a Swedish intensive care unit (ICU). The programme included: structural components e.g. converting assistant nurse positions to nurse positions; behavioural components e.g. improvements of report routines; and attitudinal components e.g. explication of what quality of care could mean in the ICU. Planning and implementation of the programme took about 1 year. Quality of care was studied on 40 patients 3 months before the intervention and on 40 patients 18 months after. An observation and question scheme was used for data collection. using Henderson's (1960) nursing model of patient's needs as point of departure. Statistically significant improvements of quality of care were noted on several observations at the postintervention assessment. Most of the improvements were noted on activities aimed at assisting the patient with basic physical needs such as breathing, nutrition, elimination, movement, sleep and rest, and avoiding dangers. No effects were noted on activities aimed at assisting the patient with psychological and spiritual needs. Discussing the results, the multimodal character of the intervention programme was believed to be a significant factor.