Building upon the theoretical and practical foundation outlined in their previous book, Educating English Learners, the authors show classroom teachers how to develop a repertoire of instructional techniques that address K-12 English learners (ELs) at different English proficiency and grade levels, and across subject areas. Show, Tell, Build is organized around two decision maps for planning and implementing differentiated instruction for ELs: the Academic Subjects Protocol (for teachers of academic subjects) and the Language Arts Protocol (for teachers of language arts). The instructional tools and techniques described in each chapter help teachers provide communication support for ELs through showing and telling, and develop their language proficiency through building their skills. The book also discusses the demands that academic language poses for English learners and ways to assess students' proficiency in English. Show, Tell, Build provides classroom teachers, English language development specialists, literacy coaches, and school leaders with valuable knowledge and skills to support ELs' academic success.