Book excerpt: While native corpora and corpus linguistic tools and methods have been used and applied for quite some time in the development of learning and teaching materials, learner corpora are only just beginning to impact the field of language teaching, testing and assessment. This volume helps to close this still existing gap and highlights the great potential of learner corpus research for language pedagogy by presenting a selection of 11 original studies on learner corpora, conducted by established experts as well as by excellent young researchers. The papers included in the volume present new corpora and methods; studies on written as well as spoken learner corpora and on using data-driven learning scenarios in the classroom. All papers include sections on practical and concrete language-pedagogical applications. This volume will be of significant interest to researchers working in corpus linguistics, learner corpus research, second language acquisition and English for Academic and Specific Purposes, as well to language teachers and materials developers.