Increasing numbers of American adults are engaged in many types of learning activities; a significant part of these learning activities are organized and structured. Record-keeping about institutionalized adult learning is often scanty, however, or even non-existent. As the social goal of a "learning society" has been articulated, it has become increasingly important to gain a firmer grasp of the whole of the organized adult learning structure. This monograph, aimed at those professionally engaged in education and training matters, and others concerned to know more about what the structure of organized learning opportunity for adults includes, describes the whole of the structure of organized adult learning opportunities. It includes a description of the education and training programs of private industry and business, all of postsecondary education, federal, state, and local government, the cooperative extension service, correspondence instruction, etc. Program objectives, expenditures, and enrollment data are provided for all of these programs. Recommendations for future action are given. (KC)