In the humanities and social sciences, critical theory has two quite different meanings with different origins and histories, one originating in social theory and the other in literary criticism. Though until recently these two meanings had little to do with each other, since the 1970s there has been some overlap between these disciplines. This has led to "critical theory" becoming an umbrella term for an array of theories within academia. [wikipedia]
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Jonathan Culler's Literary Theory: A Very Short Introduction ISBN 019285383X
Critical Theory [wikipedia]
