Recent developments in dynamical theories of the liquid/glass transition.

Recent theoretical advances in the kinetic description of supercooled liquids and glasses are reviewed. Key experimental observations and phenomena associated with the glass transition are discussed, with emphasis placed on those features common to many types of materials. We introduce the various hypotheses on which modern theories of structural glass dynamics are based and discuss a few microscopic models that exploit these ideas. A critical analysis of the foundations and predictions of the models is presented. We conclude with a discussion of the information obtained from these studies and of the many questions that remain. The present manuscript was prepared for publication in Annual Review of Physical Chemistry.