It is said that there are generarly four temperaments:
It is also said that each individual has a mixture of mostly two of the four. Well, I am not a psychologist, or an other kind of expert in the matter, but I would like to intruduce them to you. 4marks.com does a good job of detail description with examples. Plus you can to a test and discover your own temperaments.
In schoenstatt we were introduced to them so we can know ourselves better, develop virtues and fight vices. Again 4marks does an other great job of listing a number of virtues and vices associated with each temperaments or combination. So learn about yourselves and compare with your friends if you can, and have great relationships.
If you happen to be my friend pay attention here: My temperament combination is: Melancholic (92%), and Phlegmatic (8%); one of those mysterious boxes out there! So, please forgive me for whenever I displayed the vices associated with this combination around you, be assured that I am fighting them. Of course they are discrepancies in %s as I noticed that the test wasn't detailed enough for me. Oups! sorry for my criticism! I said I am fighting that!