Current literature indicates that vocational assessment in the field of career counselling and guidance has been dominated by quantitative and empirical methods. Recent criticism of the field from the post-modernist perspective has stimulated the development of theories that account for the presence of a wider range of influences in an individual's phenomenal world with respect to career. This study investigated the practical efficacy of a semi-structured interview (derived from the Systems Theory Framework (STF)) which was developed for application in the career counselling service at a university. Another interview derived from ‘standard’ practice methods was also developed for comparison purposes. Clients of the careers counselling service received either form of interview in an experiment that utilised a pre-test/post-test design. Three measures of outcome (self-exploration, environment exploration and attributional style) were used to assess the two interview methods. The results indicated that the interview based on the STF has some tentative merit as a potential alternative method for career assessment.