AnimumSerenum

Dr. John Gottman at the University of Washington has been researching marriages for two decades. The conclusion of all that research, he states, is that unless a couple is able to maintain a high ratio of positive to negative encounters (5:1 or greater), it is likely the marriage will end.
With 90 percent accuracy, Gottman says he can predict, often after only three minutes of observation, which marriages are likely to flourish and which are likely to flounder. The formula is that for every negative expression (a complaint, frown, put-down, expression of anger) there needs to be about five positive ones (smiles, compliments, laughter, expressions of appreciation and gratitude).

http://www.huffingtonpost.com/ocean-robbins/having-gratitude-_b_1073105.html