The document describes the features and goals of the Touchstone English language learning series. It was created using a large database of authentic English conversations, media, and texts called the Cambridge International Corpus of North American English. The corpus helps the creators choose grammar, vocabulary, and conversation strategies that reflect how English is actually used. The Touchstone series aims to teach useful, real-world English in a fun way through interactive class activities like role-playing and discussions. It also provides additional resources like workbooks, audio CDs, and self-study materials to help students practice and assess their progress in understanding and communicating in English.