The study group consisted of 12 individuals who had participated in the above-mentioned original study of a behavioral activation treatment administered via smartphone. The participants for the original study were mainly recruited via mass media and advertisements in large Swedish newspapers. The main inclusion criteria were: suffering from major depression according to the DSM-IV,with at least an episode in partial remission, and having a point total of ≥5 on the 9-item Patient
Health Questionnaire Depression Scale (PHQ-9) . A more detailed information of the inclusion criteria and its process
has been described elsewhere.