Our aim in this paper, which was prepared for an international conference on comparative procedural law to be held in July 2011, is to advance understanding of private enforcement of statutory and administrative law in the United States, and, to the extent supported by the information that colleagues abroad have provided, of comparable phenomena in other common law countries. Seeking to raise questions that will be useful to those who are concerned with regulatory design, we briefly discuss aspects of American culture, history, and political institutions that reasonably can be thought to have contributed to the growth and subsequent development of private enforcement in the United States. We also set forth key elements of the general legal ...