This volume is specifically dedicated to interlanguage request modification. It is a collection of empirical studies carried out by an international array of scholars which provides insights for researchers, graduate students and language teachers on patterns of interlanguage request modification in a range of research contexts and linguistic/cultural settings. The research in this volume takes the reader from a consideration of interlanguage request modification in naturally-occurring e-mail data, through to elicited data from e-DCT questionnaires on cyber-consultations, to the interactive oral discourse of requests in open role-plays. As a whole, the contributions incorporate research with learners from a range of proficiency levels and from diverse linguistic/cultural backgrounds while the papers individually examine developmental aspects of interlanguage request modification, requests in electronic contexts, comparative learner/native speaker requests, and instructional effects on mitigation.