According to Chris Keith, there are "two competing 'models' for how to use the gospel tradition in order to approach the historical Jesus [...] A first model, inspired by form criticism and still advocated today, attempts to attain a historical Jesus ‘behind’ the interpretations of early Christians. A second model, inspired by advances in historiography and memory theory, posits a historical Jesus who is ultimately unattainable, but can be hypothesized on the basis of the interpretations of the early Christians, and as part of a larger process of accounting for how and why early Christians came to view Jesus in the ways that they did." According to Keith, "these two models are methodologically and epistemologically incompatible," calling into question the methods and aim of the first model.