The purpose of this book is to conceptualise the research on dictionary use within a more general overview of language learning. It brings together some of the findings of studies on dictionary users and uses and shows how research into dictionary use can contribute to the improvement of dictionary design and the clarification of issues in language learning. The book also provides reports on a series of empirical studies on dictionary use in decoding activities (reading comprehension and L2/L1 translation) , which will shed some light on the nature of the issues discussed throughout the book.