There has also been some discussion of the concept of knowledge in terms of both reliability and fallibility. Let us begin with the former. Succinctly put, reliabilism holds that a belief is knowledge if it is true and if it was produced, or is sustained, by a reliable process that yields mostly true beliefs. Reliabilist theories of knowledge require a reliable mechanism for belief formation, but do not require that the epistemic agent be aware or have evidence of the mechanism’s reliability. Fo