Better outcomes are reached in collaborative care compared to care as usual. Several systematic reviews showed effect sizes ranging between 0.3 and 1.2 for collaborative care compared to care as usual in the general practice setting (Coventry et al., 2014). These differences depended on the form of collaboration between GP, CM and CL, and on the kind of mental disorder under treatment (Van der Feltz-Cornelis et al., 2010). It turns out that collaborative care models in which the CL actually sees the patient and provides written consultation advice to one professional (i.e., either GP or nurse CM) (Hoedeman et al., 2010) is the most effective model. Furthermore, the model is more effective in somatoform disorder and anxiety disorder than in depressive disorder (Van der Feltz-Cornelis et al., 2010), suggesting that depressive disorder may need a more sustained treatment effort and that anxiety disorders and somatoform disorders may be more reactive to short-term treatment in the general practice setting.