Interactions consists of ten texts plus two instructor`s manuals for in-college or college-bound non-native English students. Interactions I is for high-beginning to low-intermediate students, while Interactions II is for low-intermediate to intermediate students. Within Each level, I and II, the books are carefully coordinated by theme, vocabulary, grammar structure, and, where possible, language functions. A chapter in one book corresponds to and reinforces material taught in the same chapter of the other three books at that level for a truly integrated, four-skill approach.