Factor stability of the Schalock and Keith (1993) Quality of Life Questionnaire.

In the 1990s, there was a significant change in how governments viewed publicly provided services. In the area of disability services, it has been suggested that providers could demonstrate their effectiveness with reference to the quality of life of their clients. One instrument often used in quality of life research for people with intellectual disabilities is the Quality of Life Questionnaire; however, before this instrument can be used with confidence, the reliability of its scores must be demonstrated.