The series is designed to teach English as a second language to adult learners working independently or with an English-speaking friend and has also been used very successfully in classroom environments. The first level is intended for beginners or "false beginners". The second level is designed for high beginners while the third level is intended for students at low intermediate level. The last level of the series is written for high intermediate students. Each unit consists of 3 dialogs. Each dialog is repented four times. At first silently, then with audio, then with audio and key words using subtitles and then finally with audio and complete subtitles.The dialogs follow the story an American family.