Epistemology is from the Greek words 'episteme', meaning knowledge, and 'logos', meaning explanation. The term is concerned with the nature of knowledge and justification, how we know what we know. In the philosophy of the social sciences, epistemology explores how we know that we know something, ontology explores the nature of social reality, what kinds of things can be said to exist, and in what ways, and ethics deal with what we ought to do. Mainstream Anglo-American tradition separates epistemology from philosophy of science. These thinkers attempt to link epistemology with nature and ...