The prevalence of Clinical ethics support services is increasing. Yet, questions about what quality of CES entails and how to foster the quality of CES remain. This paper describes the development of a national network, which aimed to conceptualize and foster the quality of CES in the Netherlands simultaneously. Our methodology was inspired by a responsive evaluation approach which shares some of our key theoretical presuppositions of CES. A responsive evaluation methodology engages stakeholders in developing quality standards of a certain (...) practice, instead of evaluating a practice by predefined standards. In this paper, we describe the relationship between our theoretical viewpoint on CES and a responsive evaluation methodology. Then we describe the development of the network and focus on three activities that exemplify our approach. In the discussion, we reflect on the similarities and differences between our approach and other international initiatives focusing on the quality of CES. (shrink)