The investigation of my personality
Make this personality test and get a description of who you are and why you do things the way you do: https://www.16personalities.com/free-personality-test
The investigation of the personality of others
After you make the test and find out what is your personality type, read the descriptions of the other different personality types, given on the site (https://www.16personalities.com/personality-types). So you could learn what really drives, inspires, and worries different personality types, helping you build more meaningful relationships with colleagues and friends.
Then choose some person who you think you know well. For example, some of your best friends, someone from your family or a colleague with whom you are working for a long time.
Try to write down the most typical personality characteristics of this person – what do you think are his/her strengths & weaknesses, how does he/she behave as a friend or what are his/her most typical workplace habits. Try to guess to which of the different personality types he/she belongs?
Then ask this person to make the test.
Compare his/her results with your suggestion. Discuss the matches and the differences in your opinions.