We aim to chose our drive team basically using the guidelines set out in Karthik's recent talk:
https://www.youtube.com/watch?featur...YAO4NTA#t=2522
I think the more common question though is what exactly is the process by which you select these students. As for that last year we had a conference between engineering / strategy mentors and our Elders Council. The Elders Council is a formalized group of 3 "top" students plus the team Captain who we consult for decisions that require expediency and may be tough calls.
The Elders Council acts, in some ways, as a voice for the team but is also intended to prevent long drawn out discussions when hard decisions need to be made. We make an emphasis that each student should approach the meetings with a mature attitude, understanding that we will need to discuss the strengths and weaknesses of their team mates and, occasionally, themselves. So far it has worked fantastically.
It is much easier to say to a team of students who are used to running the team "Your Elders Council and mentors pick these students for the drive team" than to say "us mentors have picked these students for the drive team".