I found this book to be a much more satisfying assessment of my cat's IQ than the previous cat IQ test book I read. (And yes, I realize how sad it is that I read not one, but two books on testing my cat's IQ.)
This book seems to be more hands-on and has questions that relate to the actual behavior of your cat. The book is divided into four sections: Cat Observation Test, where you read statements about your cat's behavior and then answer Never, Seldom, Often, Usually, or Always; Cat Performance Test, where you perform several activities with your cat and then note which of 3 or 4 behaviors he does in response to the activity; Extra Credit, where your cat earns bonus points if he can do specific things; and Credit Deductions, where your cat loses points if he does any of the things listed. Then you add up all of their points, and voila! There's your cat's IQ.
Now, maybe I just liked this book because my cats performed pretty well on the test, and who doesn't like to find out that their cats (or dogs, or children) are smarter than average? But I do feel like it was a pretty objective test and more similar to an actual human IQ test than the other book that I read on the topic.