omfort-able enough that play is possible, but so challenging as to avoidboredom, eliciting player growth.
Challenges can lead to growth, but different individuals accept challenges differently. There are many members in a group. How to control this level?
People may come and go, particpants may propose fun-damentally new approaches, people may evolve from lurkers tomajor content creators or vice-versa.
Is the "people come and go" or "new approaches" positive or negative for the group? How to reduce the possibility of negativity? Is the movement of people that requires special attention? Or let it develop on its own?