There is a fundamental set of services (Core Services) found in all of the Centers, but there is some variation in the programs that are offered, the funding sources, and the staffing, among other things. Depending on the public services in the community, Centers might assist with housing referral and adaptation, personal assistance referral, or legal aid. Typically, Centers work with local and regional governments to improve infrastructure, raise awareness about disability issues and lobby for legislation that promotes equal opportunities and prohibits discrimination. Effective centers have proven to be in states like California, Massachusetts, New York, Pennsylvania, and Illinois.