Leadership
Leadership is Motivating groups of people, and people want to succeed.
A good way to motivate them is to allow them to succeed and be appreciated.
By communicating clear expectations in a respectful way that shows you are investing in the individuals, this shows that you want them to be successful.
With clear and simple expectation, there is less chance for the expectation to contradict each other. They are also able to be enforced and rewarded with little confusion.
In addition, if the expectations that you are providing help individuals build habits that are universally advantageous, this leadership will benefit their private life as well as their work life.