Kazdin uses the state-of-the-art B-mod lingo. The only thing he never made clear enough was his comparisons of positive/negative reinforcement and positive/negative punishment. This section had to be clarified by our instructor, who himself said that Kazdin confused him, and our instructor is a behaviorist.
The text contains many chart and graph illustrations that help you to understand the progress of the interventions explained in the text. However, I felt that there were too few intervention examples in the book, and the actual nuts-and-bolts "how-to" of a behavioral intervention were never given. Our instructor had to break that down for us.
All in all, it's the best of a sad lot of B-mod texts out there, but if you aren't a psychologist or a psych student, you'll find this one a tough read.