Abstract
The purpose of this study was to validate the Occupational Self Assessment (OSA). The Occupational Self Assessment is an evaluation tool and an outcome measure based on the Model of Human Occupation and concepts of client-centered practice. It is a two-part rating form that elicits client's perceptions and values concerning their own occupational competence, values, and the impact of the environment on their occupational behavior. Data were collected from 302 clients which included physically disabled, psychiatrically disabled and non-disabled adults. Rasch analysis was used to analyze the data. Results supported the preliminary validity and reliability of the OSA and recommendations are given for further improvement of the tool.
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