Affect and Trust was written out of the College of Information Science and Technology in Drexel University, PA, by Lewis Hassel. It can be found for free online here.
Hassel argues that there is a very distinct difference between trust and belief. In his model, trust is based on action, while belief is based cognitively. The example that shows this the most clearly is in the person falling backward. He may believe that the other person is going to catch him, which is based logically on evidence that the other person is strong, not likely to want to inflict him harm, in close proximity, etc. However, Hassel argues that he does not trust the person unless he actually falls. While we may believe that we trust someone, we do not until the actual action is taken.
When do we trust someone?
Bos et al showed in 2002 that we tend to trust people more when meeting them face to face
Zheng has showed that we can trust people we've never met just as well, but that it takes long, and that just seeing a picture of the person is immensely helpful. In fact, it is more helpful than seeing a datasheet of the person.
How do we model it?
Conclusion and Why do you care?
It is important to know why you trust someone and why they trust you. As we develop more advanced models of the phenomenon, we understand it better. As we understand it better, we learn how we can trust others more, and how we can build our own trust with others.