My rating for this text is probably lower than it deserves, but I can't give it more than two stars because it's terribly outdated. (I'm sure that it was a wonderful resource for educators who wished update the way composition is taught, at the time it was published.)
I might recommend this book as a starting place if you are just beginning to think about how to modernize your composition classroom, but I would also encourage you to seek texts that better deal with new technologies when it comes time to implement the ideas in Hoffman's text.