The idea of the four temperaments traces back to an Ancient Greek medical theory that there were four fundamental bodily humors (blood, yellow bile, black bile, and phlegm) which could cause illness if they were out of balance. The terms sanguine, choleric, melancholic and phlegmatic were coined by the Greek physician Aelius Galenus to describe the effect of these humors on human behavior. This idea is perhaps one of the oldest that looks like a theory of personality. The four temperaments have never been a part of modern medicine or psychological science, but remain fairly well known due to their use by self-help and spirituality authors.

The OSPP Four Temperaments Scale (O4TS) is a free and open-source measure designed to match the taker to one of the four temperaments. It was developed by finding questions that statistically predicted self identified temperament in samples of people who already has on opinion on which one they were. See the documentation on how it was developed and is scored here.

The test has 24 statements of opinion that you must rate on a five point scale of how much you agree with each. It should take most people 3-5 minutes to complete.

This test is provided for educational and entertainment use only. It should not be used as psychological advice of any kind and comes without any guarantee of accuracy or fitness for any particular purpose. Also, your responses may be recorded and anonymously used for research or otherwise distributed. This is a free personality test.