This book, along with the Gottman Institute Couples Seminars, are totally based on a secular humanistic world-view. There is no reference to a Biblical World View, or God's values in these psychology based principles. Some of it is good and practical advice. However, referencing "significant other" focus instead of wife and husband, and referring to these principles being practiced in a gay marriage as examples of how relationships should work is definitely not speaking to God's plan for a marriage between a man and a woman. No Biblical references for what a marriage should be in this book, or in the Gottman's seminars that they promote and conduct worldwide. As a Born Again Christian, I cannot recommend this book or the Gottman's seminars. I gave it two stars because there is some practical value to this book, but it does not support our God's purpose and definition of marriage.
Gottman is a pre-eminent and world-reknown researcher on marriage. I have yet to read a book that covers all of the topics necessary to have a thriving marriage but this book addresses a number of neccesities. It has a variety of assessments and exercises couples can use to improve their marriage. As a professional counselor working frequently with couples I use principles, assessments, and exercises from this book often. It's not exhaustive, but what it does address it addresses well.