In Personality Plus, Florence Littauer argues that there are four basic temperaments:

1. Popular Sanguine
2. Perfect Melancholy
3. Powerful Choleric
4. Peaceful Pragmatic

She also argues that knowing your temperament and those of others you interact with enables you to live a fuller, freer, richer life.

I don’t like these sorts of ideas, but I tested myself and found that my strongest tendency is as a Powerful Choleric with secondary Popular Sanguine aspects. It turns out to be scarily true.