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You can assess team members with the free Myers Briggs personality test: https://www.16personalities.com
Read the book "Quiet" of Susan Cain:
- to get the most of the "Big Five" personality system: Extroversion | Conscientiousness | Agreeableness | Openness to Experience | Emotional Stability
- to understand the spectrum between extroversion | ambiversion | introversion (extroverted people preferring more stimulating environments and introverted ones less stimulating environments)
Map your team's personality profile by asking if each is:
- Extroverted?
- Open to Exp?
- Conscientious?
- Agreeable?
- Emotionally stable?
Then infer the diversity and the team average on each trait.