Neil Warren found 100 couples who had tremendous marriages. He studied them to find out what the crucial traits were that characterized these kinds of marriages. He found ten traits: They have dreams about their future. They are thoroughly committed to the marriage. They trust one another. They are emotionally healthy. They have passion and romance. They have become good communicators. They have learned how to do conflict well. They have a rich sex life. They are connected to family and friends. They serve and follow Christ together.
Warren peppers each chapter with anecdotes from the 100 couples. Each chapter is filled with practical ideas and real-world examples.
This is one superb marriage book, the best I have read.
(It is out of print and can be ordered from Amazon.com used books.)