Drew Houston is the CEO and co-founder of Dropbox. He said that learning about the Enneagram test was the most helpful thing he did in the last five years. He highly recommends it to everyone working at Dropbox.
By knowing more about yourself and other people who use this test, you will better understand other people and strengthen your relationships.
Find a free Enneagram test online.
Ask your friends to do it as well. Compare the results.