[QUALIFY--a tool for assessing quality indicators].

Quality indicators are used world-wide to control the quality of health care. To be effective these indicators have to meet quality criteria themselves. But until now there has been no fully operational method for assessing indicators. Using a systematic review of existing criteria and scientific analyses the criteria set QUALIFY was developed. Particular characteristics of QUALIFY include clear definitions of all criteria, consistent information as the basis of assessment and a standardized approach throughout the assessment process. QUALIFY comprises 20 criteria which are assigned to the three categories relevance, scientific soundness and feasibility. It was tested during the assessment of 55 indicators and served as the methodological basis for selecting those quality indicators that German hospitals are required to report publicly.