In this dissertation I defend five claims about trust: 1) trusting and trustworthiness are conceptually but not causally connected; 2) trust is risky; 3) trust requires good will; 4) trust is a two-part relation; and 5) trust is an interpretative framework. A concern for trust often appears in discussions about testimony and the expectation of truthfulness; Bentley Glass, John Hardwig, and Jonathan Adler each address the role of trust in science while assuming a necessary connection between trusting and trustworthiness. I argue that this conception is untenable because a justification for one fails to suffice as a justification of the other. I show, instead, that it is our assessment that links trustworthiness to trusting. My second claim, ...