This caught my eye:
Click through to read more about entering buildings — libraries, for example? Then, cick on to “Progressive Trust:”
Thus progressive trust is a useful conceptual model for understanding how trust might be built using online tools. Look at the tools that you are using now — do they support various levels of trust, and a natural path between them? Or is trust more binary — someone is only trusted, or not trusted. Are there implicit levels of progressive trust that are part of the culture of your group that might not embodied in the software itself?