My wife and I discovered this book nearly two decades ago, and we still often reference it to this day. This book has helped us have a better understanding of ourselves, each other, coworkers, and our children. The material is relevant, detailed, and most importantly, MEMORABLE. You will remember the material, and be able to incorporate its understanding into day-to-day situations. I cannot recommend this book highly enough. It is a must for parents, couples, and self-employed individuals.