Studies show that human errors contribute to up to 70% of mistakes and mishaps in health care. Crisis resource management, CRM, is a conceptual framework for analysing and training individual and team skills in order to prevent and manage errors. Different CRM training methods, e.g. simulation, are in use and the literature emphasises the need of training the full team or organisation for maximal effect. CRM training has an effect on skill improvement, but few studies have shown an effect on patient outcome. However, these studies show great variability of quality.