In the video games Star Trek: 25th Anniversary
Star Trek: 25th Anniversary, Star Trek: Judgement Rites
Star Trek: Judgement Rites, and Star Trek: A Final Unity
Star Trek: A Final Unity, the away teams are explained very rationally - e.g. Kirk commanded the team, Spock provided physical scientific knowledge, and McCoy biological sciences.
But I want to know who was most typically sent down to unknown worlds on TNG and why?