Background: Actual practice in the Netherlands has shown the need of an instrument to evaluate the quality of support plans. This article describes the development of an instrument for such evaluation. Method: The concept of quality of life (QOL) domains were used to develop an instrument to evaluate the quality of support plans within a QOL conceptual and measurement model. Information from the literature and client files was used along with expert judgement. Results: Views on support can be divided in two dimensions: an emphasis on the person and an emphasis on relationships. With this information an instrument was developed for self-evaluation and one that is intended for the drafters of support plans. Conclusion: Data from 268 respondents demonstrated the instruments reliability and validity. © 2005 Blackwell Publishing Ltd.