Comment on: "Evaluation and comparison of guidelines for the management of people with type 2 diabetes from eight European countries" by Stone et al. on behalf of the GUIDANCE study group (Diabetes Res Clin Pract. 2010; 87(2): 252-60).

The authors compared eight national type 2 diabetes guidelines for key process and outcome indicators. The comparison was performed after accurate selection, and quality of the different guidelines was assessed by means of the AGREE instrument, developed to address the issue of variability in guideline quality. Unless this precise methodological description some concerns remain after reading the paper.