 While the externalist defends radically different views than those of classical foundationalists, the structure of knowledge and justification that emerges from such theories is still often a foundationalist structure. We might first illustrate the point by examining the view defended by the most prominent of the externalists, Alvin Goldman’s  reliabilism.[6]  The fundamental idea behind reliabilism is strikingly simple. Justified beliefs are reliably produced beliefs. Reliably produced beliefs are beliefs that are the product of a reliable process, and a reliable process is one that yields beliefs that are usually true (or would usually be true if enough of them were  generated).[7]  Justified beliefs are worth having because justified beliefs are probably true.