This book provides both principles and practical guidelines for Less Commonly Taught Language (LCTL) teachers of all levels and languages to transform raw materials into activities for the language classroom. Grounded in research, the author lays out a series of principles that serve to remind teachers of the possibilities that exist when they consider using authentic materials in the classroom. Each principle in the book is accompanied by numerous practical examples in a wide variety of languages created by the author and by teachers who have participated in a summer institute led by Bill Johnston and Louis Janus at CARLA since 1999.