What is the science behind trust? How does trust build, and how does it break down? While it is much easier to measure transactions than trust, Stephenson models the threshold size for networks which contain key nodal elements such as hubs, gatekeepers and pulse-takers. Through numerous examples and business case studies, these analyses begin to give a good grasp on models for healthy networks. Stephenson closes her talk by looking ahead to the challenges of heterachy, the networking of institutions, which now demands an even greater capacity for trust and understanding.