The Proliferation of Action Theories and Their Applications Jaan Valsiner and Louis Oppenheimer Our contemporary psychology becomes satiated by references to action and activity. Over the recent decade numerous theoretical perspectives have appeared. all of which operate with the tion of action (Ajzen. 1985; Eckensberger & Silbereisen. 1980; Keller & Reuss. 1984; Lantermann. 1980). each of which define it (see Oppenheimer. Chapter 1 of this volume). Likewise. the empirical literature in child psychology is filled with action-theoretic tions--facilitated by the ease of seeing children acting within their environments at a pace that surpasses that of even the most hyperactive adult! Of course. the empirical discourse in contemporary psychology is highly limited by its empiricistic emphasis. which dissociates empirical work from theoretically elaborate reasoning. At times. one can find in the literature an anything goes attitude--as long as the umbrella (theoretical) tion under which the given empirical study looks consensually respectable. the theoretical needs of research are satisfied. and psychologists can continue to accumulate data in their pursuit of rmal science. The latter attitude to theory. of course, is but a convenient illusion. For any serious hope for progress in any discipline, the conceptual sphere must be explicitly developed further together with the empirical efforts. This sentiment led us to organize a symposium at the conference of the Society for Research in Child Development (SRCD) in Baltimore, Maryland, in 1987. The presentations at that symposium gave us the idea of editing a book on the origins of action.