Norms are models of correct or appropriate behavior and of correct or appropriate behavioral products. Since translational behavior is conceptualized social behavior, translation norms are understood as internalized behavioral constraints which embody the values shared by a community. Gideon Toury and Theo Hermans, the main contributors to this volume, have been highly influential in the development of the concept of norms as an analytical tool in studying translations. They argue that all decisions in the translation process are primarily governed by norms and illustrate the interplay between the translator's responses to expectations, constraints and pressures in a social context.