 One of Dr. Wolfensberger's more important but under-utilized contributions to service design, operation, and quality is the construct of “model coherency” which developed over time.It began in 1968 when the Nebraska state legislature enacted a new mental retardation service reform bill and provided service funding.Wolfensberger and other key actors in shaping this reform wanted to see the newly available monies shifted away from institutional services toward a new system of community services based on normalization ideas.