2.1. Inclusion of participants

A convenience sample of fifty-six patients receiving FACT at Mentrum, an SMI treatment centre in Amsterdam, the Netherlands were screened for eligibility. Patients received FACT for (combinations of) psychotic, mood, anxiety, and personality disorders. Inclusion criteria were age ≥ 18 years, permanent housing, and fluency in Dutch. Exclusion criterion was an unstable psychiatric condition which required hospitalisation. Of the 56 screened patients, 47 were found eligible and non-randomly allocated to BI (n = 25) or to CAU (n = 22). Recruitment, treatment, and data collection took place between November 2012 and April 2013.