Unfortunately, at this stage it seems that my travel route is not populated with many tween girls. I had hoped to be able to observe groups of tween girls having animated conversations about tween girl things in relaxed, naturalistic tween girl setting. Not to be, it seems. No tweeny commuters doing tweeny things.
I know I can learn a lot from Brenda Laurel:
"To be an honest researcher, you must resist the enormous
temptation to interpret as you go in terms of your own
experience and values"
(from "Utopian Entrepreneur")