One of the major goals of occupational therapy in psychiatry is to assist people with mental health problems to return to a productive lifestyle (Pratt and Jacobs 1997, Fan et al 2007, Blank and Hayward 2009, Waghorn et al 2009). In order to provide relevant services to clients who need vocational rehabilitation, there is a need for evaluation tools to identify the strengths and limitations of those clients (Fan and Pan 2009, McFadden et al 2010). The purpose of the study was to examine the validity of one of the proposed instruments, the Model of Human Occupation Screening Tool (MOHOST), as applied in a group of people with mental health problems receiving vocational training. People with mental health problems experience a range of challenges, which contribute to unemployment (Marwaha and Johnson 2004). The unemployment rate for people with mental health problems was high in studies over the past two decades in western countries such as the United Kingdom, the United States, Germany and France (Bond and McDonel 1991, MacDonald-Wilson et al 2001, Marwaha et al 2007). These challenges include symptoms, comorbidity of other impairments and medication side effects,