Here is the great presentation on people matters in Agile teams - Tuning the Agile Team Engine by Tom Wessel
Main takeaways:
Book must read - The Human Side of Agile - How to Help Your Team Deliver
by Gil Broza.
Servant leadership: isolate team from distractions, screen-off pressure, facilitate resources, delegate - make people accountable.
Feel of Purpose, Mastery and Autonomy are the components for workplace happiness (Motivated Performance).
Team dynamics: it may take up to 5 months to get a team in the shape, going through Forming (1 month), Storming (2 months), Norming (2 months) before the team becomes Performing.
Team Smells - agile "antipatterns". "Stars" can be toxic.
Performance reviews: Team Based vs. Stack Ranking (individual).
Personality tests for members psychological compatibility: Try DISC.