Accessibility and quality of health services is the subject of the 28th international conference of the EURO working group on Operational Research Applied to Health Services (ORAHS). The objectives of the group are exchanging ideas, information and know-how concerning the application of OR approaches and methods. The Federal University of Rio de Janeiro hosted the 2002 meeting in Brazil. The conference incorporated ten sessions on quality health care, emergency services, health care evaluation, scheduling personnel, location of health units, performance assessment, decision support systems, admission systems, information systems and performance measurements. A selection of 20 of the 37 papers presented at the sessions is enclosed in this book.