Trust & Play Resources

I just found this article on The Trust Spectrum, a design framework for multiplayer games, particularly ones involving co-operative play. It is also a wonderful source of information on trust and design.
The idea is that different multiplayer activities call for different amounts of trust, which can create barriers for an audience and I came to understand that their Trust Spectrum is about “trusted” groups, and how you design for them. How do we design for groups or individuals when trust is not there yet or even lost?

Do you know any existing frameworks or resources that you can share?
What other trust & play resources can you share?