Directs the Washington institute for public policy to conduct a study and comparison of the characteristics and service needs of clients of the division of developmental disabilities who are not receiving paid services by the division and those who are receiving paid services. The institute shall design a sampling strategy to guide the department of social and health services in conducting assessments such that assessment data would be available on a statistically valid sample of the clients not receiving paid services by the division of developmental disabilities to compare to a sample of clients receiving paid services.

Requires that not later than November 1, 2006, the institute shall report to the governor and the legislature including, but not necessarily limited to: (1) The nature and severity of the service needs of clients receiving and not receiving paid services by the division;

(2) Demographic information, including income information, for those receiving and not receiving paid services by the division;

(3) An analysis of the differences between the two groups.

Requires that, not later than June 30, 2007, the institute shall provide a six-year estimate of service needs of the state's population of individuals with developmental disabilities, done in conjunction with the caseload forecast council.