The interactions two programs consist of five texts and a variety of supplemental materials. For low-intermediate to intermediate students seeking to improve their English languaje skills. Each of the five texts in this program is carefully organized by chapter theme, vocabulary. Grammar structures, and where posible languaje fuctions. As a result information introduced in a chapter of any one of the interactions. Two texts corresponds to and reinforces material taught in the same chapter of the other four books, creating a truly integrated, four skills approach. The interactions two program is highty flexible.