Touchstone共分為四級，適合初、中級英語學習者，課程內容參照「劍橋英語語料庫」(Cambridge English Corpus)，運用其中收錄的真實語料，希冀以最道地的英文補強學習者聽、說、讀、寫四大語言技巧。此外，更利用語料庫中的常犯錯誤語料，藉以提醒學習者避免犯錯。
Touchstone Second edition is an innovative four-level American English course for adults and young adults, taking students from beginning (A1) to intermediate (B2) level. Each Student's Book contains approximately 90 hours of material across 12 topic-based units - with additional grammar and pronunciation practice added for the Second Edition. Student's Book, Level 4 is at the intermediate level (B1-B2). This version of the Student's Book also contains an activation code that grants access to the Online Workbook, Level 4 for 12 months. The Online Workbook provides practice of the language studied in the Student's Book. Exercises are graded automatically and students can easily track their progress and scores.