Current Issues in Comparative Grammar illustrates the diversity and productivity of research within the principles and parameters framework of generative grammar. In combination, the papers in this volume address a rich and varied set of issues in the study of comparative grammar, including the theories of binding, case and government, the parametric effects of inflection, the syntactic properties of infinitival constructions, the analysis of expletives and of clitics, and the interpretation of anaphoric properties at the level of Logical Form. The collection employs several different research strategies, ranging from a broad survey of related constructions in a wide range of languages to the close analysis of an unusual construction in a single language and its consequences for the theory of Universal Grammar. Some of the papers collected here are commentaries on others, or responses to commentaries.