I think this is in some notes created or passed through legendary Don Meyer.
The Foxhole Test
Have your players take the foxhole test. Draw a circle to represent their foxhole. Write their name at the front of the foxhole. Draw a line at their rear, their left, and their right. On each of those lines they write the names of teammates they would want in their foxhole if they were fighting a life and death battle.
The position to their rear is worth three points and is awarded to their most trusted, courageous, and tough teammate. The position to their left is worth two points and is awarded to the second most trusted, etc. teammate, and the position to their right is awarded to the third teammate they would pick and is given a value of one point.
This test cuts through all the friendships, cliques, and is the truest measure of what players really think of their teammates. It might be a good idea for each coach on the staff to do this with his/her coaching staff, administrators, teach associates, and of course your team.