This article addresses theoretical and research frontiers for learning research, a second theme of Professor Argyris essay—the lead article in the “Crossroads” section. We outline three key theoretical questions for further work. We call for more systematic empirical learning research, suggesting that the paucity of such research may have resulted less from defensiveness than from the demanding requirements of doing crisp, systematic learning research. The need for scholarly empirical work is enhanced, we believe, by the growing popularity of organizational learning models among practitioners. Concurring with Professor Argyris' broad concern with enhancing research fruitfulness, we suggest ways to supplement traditional organizational research methods. In particular, we argue that it makes sense to cast wider nets for models of learning and adaptation, to sustain qualitative investigation, to use simulation techniques, and to maintain stronger—and perhaps even experimental—linkages between applied and theoretical research.