If recent scientific research on happiness -- and there has been quite a bit -- has proved anything, it's that happiness is not a goal. It's a process. Although our tendency to be happy or not is partly inborn, it's also partly within our control. And, perhaps more surprising, happiness brings success, not the other way around. Though many people think happiness is elusive, scientists have actually pinned it down and know how to get it. Sonja Lyubomirsky, a professor of psychology at UC Riverside and author of The How of Happiness: A Scientific Approach to Getting the Life You Want led controlled studies to determine what behaviors positively affect happiness, and has come up with at least 12 strategies that measurably increase levels. For instance, one strategy she's tested is the practice of gratitude. In her gratitude study, she had a group of 57 subjects express gratitude once a week in a journal. A second group of 58 expressed gratitude in a journal three times a week. And a control group of 32 did nothing. At the end of six weeks, she retested all three groups and found a significant increase in happiness in the first one. She and other researchers also recommend practicing forgiveness, savoring positive moments and becoming more involved in your church, synagogue or religious organization. "Not every strategy fits everyone," she says. "People need to try a few to find which ones work." Although Lyubomirsky likes to let people define happiness for themselves, clinically, she describes it as "a combination of frequent positive emotions, plus the sense that your life is good."

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