It’s no surprise that the words “marriage” and “work” are so often uttered in the same breath. After all, once the vows are said and the last crumbs of the wedding cake gobbled up, the real work begins. And while couples dive headlong into the rites of married life, such as buying a home and having kids, they often forget the day-to-day maintenance (translation: work) needed to keep their relationship happy and strong. John M. Gottman, PhD, is the author of The Seven Principles for Making Marriage Work, first published in 1999. The book’s advice is precious for any couple, no matter how long or how happily married they are. The book, which Gottman co-authored with Nan Silver, is the result of his landmark study of how married couples interact on a daily basis. Couples were filmed in a Love Lab, a home-like setting where they were asked to carry on their normal, daily interactions, but with video cameras present. Sort of like reality T.V.without the audience watching at home. Gottman and his team studied couples in the Love Lab for 16 years, to the point, he claims, that he could predict with 91 percent accuracy, which couples would divorce.