[A concept for the implementation and evaluation of the guideline "Early Detection of Breast Cancer in Germany"].

Systematically developed, evidence- and consensus-based guidelines are important tools for improving health care services. The effectiveness of a guideline does not only relate to its methodological quality but also to the implementation strategy used. The following paper describes the systematic development of a strategy for implementing and evaluating the guideline "Early Detection of Breast Cancer in Germany" as part of a national project. A multi-faceted systematic implementation strategy has been developed addressing existing barriers and building on projects that have recently been introduced in Germany to improve the early detection and management of breast cancer. The aim is to induce behavioural changes in women as healthcare recipients and physicians as healthcare providers, both involved in the medical decision-making process within the scope of the guideline. Furthermore, it supports organisational changes to assure compliance with the guideline by means of quality assurance and quality management. To ensure evaluation of the implementation process a set of quality indicators have been identified for the baseline assessment of structures, provider performance and outcomes. Both the effectiveness of the implementation process and the effectiveness of the guideline itself will be measured by using the same set of indicators for reevaluation within a pre-defined time interval of 18 months. The quasi-experimental design of this uncontrolled before and after implementation study outlined in the present paper allows the assessment of clinically relevant changes using quality indicators that measure the effectiveness of the guideline on a national level.