[Dynamics of interdisciplinary around a health care network: simultaneous programme design and evaluation planning]

This article reports on the evaluation experience of a multiple sclerosis care network in the Midi-Pyrénées region (MIPSEP). It shows how an evaluation team composed of public health doctors and sociologists progressively and naturally evolved from having a purely external observation role towards having a collaborative role actively working with the network's members and partners. A qualitative method was chosen for the data collection through interviews with the network's actors, and the frameworks for reference were constituted from official texts which defined the networks and their missions. Coming from a curative and healing culture, the network's actors were concerned primarily about how to organise themselves in order to better respond to the needs expressed by the patients. The various professional backgrounds and cultures, faced with different perspectives from innovation and confronted with the related difficulties, participated in a collective expertise exercise and collaborated in the construction process. This example supports an open, qualitative, evolutionary evaluation approach which is done in close proximity to the field and work on the ground. The study is timely given the current explosion of debate on evaluation methods. With a great deal of exchange and reflection on suitable tools and indicators as well as the respective roles of researchers, care givers and decision-makers, the results of this study advocate to favour multidisciplinary approaches, including opening up this process to funders and planning authorities rather than over-theorising about it, which only serves to enclose and paralyse a process that, on the contrary, should aim to be more inclusive. This could be a useful way to decompartmentalise and break down existing barriers within the health system.