[Economic evaluation of health networks: why and how?].

Although economic evaluation of health networks is part of the legal obligations that have to be met since March 2007, its contours still have to be defined. The purpose of this paper is to present the reasons for and approaches to such an economic analysis. Lessons will also be drawn from two economic evaluations carried out in other areas than health networks (respectively, task delegation between health care professionals and the assessment of added value for health care technologies).