The How of Happiness by Sonja Lyubomirsky
I've been doing The Science of Well-Being class on Coursera, and one of the books the professor, Laurie Santos, mentioned was The How of Happiness by Sonja Lyubormirsky, so being the person that I am, I picked it up.
According to Lyubomirsky, 50% of your happiness level is genetic, you can't change it. By nature, you have a set happiness point that may be higher or lower or right on track with the average. 10% of your happiness is based on life circumstances, like being married or divorced, rich or poor, healthy or ill. That leaves 40% that we can directly effect. She gives research to back up these numbers. The remainder of the book is about ways to improve that 40% of our happiness we have control over, activities we can do to become happier.
There are several "quizzes" in the book to help you find your current happiness level, and find which happiness strategies will play to your strengths....