Cooperative testing is a rather specific and practical aspect of validity generalization or test transportability. It refers to two or more units of government combining their testing and/or recruiting efforts. The Intergovernmental Personnel Act of 1970 (P.L. 1-648) made specific provision for cooperative examining in stating that the Civil Service Commission may join, on a shared-cost basis, with State and local governments in cooperative recruiting and examining activities under agreed upon procedures and regulations. Cooperative testing can also be thought of as the referral by one government to another of any names prescreened by any test or qualification. The need for broadening the concept of cooperative testing became evident as review of existing and proposed cooperative agreements raised psychometric, legal, and policy questions concerning the interchange of test scores, including the extent of Federal responsibility for ensuring the job relatedness and fairness of tests used for more than one government. This review took place in the spring of 1973 when a task force of operating, legal, and psychometric experts met within the Civil Service Commission. The results of that review, as they relate to cooperative testing, are the basis for this paper. (Author/MV)