BMC Public Health 2007, 7:74 http://www.biomedcentral.com/1471-2458/7/74 validate the ASE-questionnaire in this study. This might not only increase the quality of this study but can also pro- vide a questionnaire for other researchers. The study already started at the end of 2005. The inclusion of patients will take one year, till the end of 2006. The one-year follow-up period of all patients is finished at the end of 2007 and results will then become available. If this study appears to have positive effects, the behavioural intervention might also be implemented in other care set- tings. List of abbreviations used ASE-model = Attitide, Social influences and self-Efficacy model DCS = Diabetes Care System, West-Friesland, The Nether- lands CBT = Cognitive Behavioural Therapy GP = General Practitioner MI = Motivational Interviewing PST = Problem Solving Treatment Competing interests The authors declare that they have no competing interests. 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