The investigators will use both action (objectives 1-2) and evaluative (objectives 3-5) research in order to attain specific objectives: 1) Develop and implement a preceptorship-based CME complemented by a web site for physicians and nurses working in Family Medicine Groups (FMGs). This CME will be based on needs assessment and will be validated by one FMG using questionnaires and semi structured interviews. Also, references and teaching tools will be available for participants on the web site. 2) Establish a collaborative intra/inter-regional interdisciplinary network to enable on-going expertise update and networking for FMG teams. This tool consists of a discussion forum including exchanges about difficult "cases" and a monthly virtual meeting of all participants. 3) Evaluate the implementation of this integrated system at the level of the ability to form a number of 8 FMGs/year, access and utilization of the electronic tools and participants' satisfaction (physicians, nurses and experts). This will be measured with the help of questionnaires and web logging tools. Questionnaires and group interviews will also be performed in order to evaluate participants' satisfaction. 4) Determine the impact for the participants at the level of knowledge and expertise, attitudes and perceptions, and self-efficacy regarding the management of obesity. Questionnaires and interviews will be used to this purpose. 5) Deliver transferable knowledge for health professionals and decision-makers. Strategies and pitfalls of setting up this program will be identified, performance indicators series will be developed and accessibility to care will be evaluated for each FMG and the 2nd line team. A knowledge transfer plan will be elaborated and applied.