Study Rosenfield (1992): study US 1988
- Public
 - 20-70 aged, chronic mental patients, USA, 1989
 - Sample
 - Respondents
 - N = 157
 - Non Response
 - 7%
 - Assessment
 - 
        Interview: face-to-face                    
By clinical psychologists and psychiatric nurses. 
Correlate
- Authors's Label
 - Vocational skills
 - Our Classification
 - 
            
 - 
                        
 - Distribution
 - M=1.66
 - Operationalization
 - Selfreport on questions related to: 
- dealing with people at work
- work responsabilities
- work expectations
- work skills
- interference of personal problems with work
Rated on an 3-point numerical scale 
Observed Relation with Happiness
- demographic characteristics:
- age
- sex
- education
- race
- number of negative events in the last year
- functioning in het area of:
- daily living skills
- social skills
- need for structure
- need for supervision
- social contacts
- positive symptoms
- negative symptoms