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To guarantee excellent performance and service, the process of identifying and treating error risks must be integrated into the total testing process. Quality Assurance Programs (QAPs) represent an important tool that allows us to identify errors and pinpoint any need for further systematic investigations, and to rectify procedures to improve the inputs and processes by which the service is delivered. The models used by the laboratory to assure quality and manage the risk of errors have been modified in line with an approach in which the identification of quality goals and the redefinition of professionals duties and responsibilities are indispensable. Error risk is currently high in some areas of laboratory activity, and QAP is needed now more than ever. The present paper provides some descriptive examples of an approach that can be followed to manage an External Quality Assessment Scheme (EQAS) and quality indicators (QIs), the main tools used by laboratories to assure the quality of their service, for the prevention of error risk. In particular, we describe the correct approach to choose EQAS, to use information from the EQAS report, to design a QI model, and to analyze any QI data. The examples highlight that any well-designed quality system can be ineffective if it is not managed by highly competent professionals with a deep sense of responsibility. Clin Chem Lab Med 2007;45:756–65. [ABSTRACT FROM AUTHOR]