Body: "Epistemology, the theory of knowledge" is the examination of the nature of justification and the rationality of belief.
Matthias Steup, Donald M. Borchert, Carl J. Wenning are some authorities of "Epistemology, the theory of knowledge".
Some reasons we look at "Epistemology, the theory of knowledge" include understand the philosophical basis of understanding, truth, belief, and justification; to know what "knowing" actually is.
Some subfields in "Epistemology, the theory of knowledge" include definition of knowledge, acquiring knowledge, regress problem, etymology, schools of thought.