Like other highly specialized fields, quality systems have their own vocabulary which we must be familiar with; it has been internationally standardized. This standard should be adhered to in order to avoid unnecessary ambiguities and confusion, and to facilitate exchange of information between disciplines. We, in the infection control field, are quality pioneers in hospitals. We have, within our discipline, created quality systems and practised quality surveillance for decades. This must be recognized. Medical quality audits intended for comparisons between hospitals, services and wards require measurable quality criteria and comparable measures for the presence of all relevant patient-related risk factors. To specify quality within our field we need much more detailed information on the effect and cost of infection control practices, as well as the costs of the infections we intend to control. To progress one step further, patients or their representatives, politicians, need to express what monetary value should be put on health, namely freedom from infection and its consequences. © 1992.