Internet Delivered Intervention Program for the Prevention and Treatment of Depression

The purpose of this study is to determine the differential effectiveness of a self applied treatment delivered via Internet for the prevention and treatment of depression, with or without support by the therapist, compared to a waiting list control group. The principal hypothesis is that the two intervention groups will improve significantly compared to the waiting list control group, and without significant differences between them. The investigators believe that the support of ICTs may be doing a similar function as the weekly support call (to offer feedback, to reinforce, to motivate the participants, etc.). Furthermore the investigators hypothesize that the intervention program will be a useful tool for a secondary and tertiary prevention of depression.