 They wrote a set of service standards to judge applications for funds, which included a standard called “specialization” that implied such things as separation of the domiciliary function, and smaller and more dispersed service settings that each accommodated people with different needs.When the service evaluation tool PASS came out in 1973 (Wolfensberger & Glenn, 1973), it contained a rating also called “Specialization,” which required that “the service provides a coherent program in which a number of variables combine harmoniously so as to meet the specific needs of each client at that particular time of his life.”  Note the word coherent in that definition.In the revised 1975 edition of PASS (Wolfensberger & Glenn, 1975, reprinted 1978), the “Specialization” rating was expanded and its name changed to “Model Coherency.”  Thus, Wolfensberger's initial concept of specialization was the conceptual parent of his construct of model coherency.