Read the following introductory paragraph and decide the method it used. Aristotle said happiness was the reward of an active life lived with sweet reason. Sigmund Freud said it was mostly a matter of work and love. Charles Schulz, the cartoonist-philosopher, claimed it was really a warm puppy. So just what is this thing called happiness? For centuries, people were too busy pursuing it to spend much time analyzing it. Now a pioneering band of researchers has finally bagged the elusive quarry or, at least, taken its measure. Using such sophisticated new tools as the five-item Life Satisfaction Scale and the seven-point Delighted Terrible Scale (On a scale of one to seven, how do you feel about your life?), social psychologists have plumbed the heart of happiness. And their answer to the age-old mystery is that it all depends.