I've studied this book since 2001 and still, after all these years, I'm still gaining from the insights Dr. Thayer explores. This is a perfect, more "academic," introduction to his work and all of the essays here were either published in academic journals and/or presented at international academic conferences.
In this collection Thayer explores (roughly): culture, communicability, structure/anti-structure, information, poetics, imagination, explanations as motives, reach vs. grasp, systems, and what a theory of communication ought to be for, among other things.
If you are interested in what the study of communication could or should be, then you will not be disappointed with the perspectives explored in this masterful collection.
As you communicate, so shall you be.