%0 Journal Article %T Evaluation of physicians' professional performance: An iterative development and validation study of multisource feedback instruments %A Karlijn Overeem %A Hub C Wollersheim %A Onyebuchi A Arah %A Juliette K Cruijsberg %A Richard PTM Grol %A Kiki MJMH Lombarts %J BMC Health Services Research %D 2012 %I BioMed Central %R 10.1186/1472-6963-12-80 %X This observational validation study of three instruments underlying multisource feedback (MSF) was set in 26 non-academic hospitals in the Netherlands. In total, 146 hospital-based physicians took part in the study. Each physician's professional performance was assessed by peers (physician colleagues), co-workers (including nurses, secretary assistants and other healthcare professionals) and patients. Physicians also completed a self-evaluation. Ratings of 864 peers, 894 co-workers and 1960 patients on MSF were available. We used principal components analysis and methods of classical test theory to evaluate the factor structure, reliability and validity of instruments. We used Pearson's correlation coefficient and linear mixed models to address other objectives.The peer, co-worker and patient instruments respectively had six factors, three factors and one factor with high internal consistencies (Cronbach's alpha 0.95 - 0.96). It appeared that only 2 percent of variance in the mean ratings could be attributed to biasing factors. Self-ratings were not correlated with peer, co-worker or patient ratings. However, ratings of peers, co-workers and patients were correlated. Five peer evaluations, five co-worker evaluations and 11 patient evaluations are required to achieve reliable results (reliability coefficient ¡Ý 0.70).The study demonstrated that the three MSF instruments produced reliable and valid data for evaluating physicians' professional performance in the Netherlands. Scores from peers, co-workers and patients were not correlated with self-evaluations. Future research should examine improvement of performance when using MSF.In view of demands for high quality care, many health care systems aim to assess physicians' professional performance. As the ability to self-assess has shown to be limited, there is a need for external assessments [1]. Reliable, valid, feasible and effective measures of performance are vital to support these efforts. Since 1993, multisource f %U http://www.biomedcentral.com/1472-6963/12/80