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This monograph is an academic explanation and analysis of Ayn Rand’s measurement-omission theory of concept formation, It also relates Objectivism to other philosophical approaches to concept-formation. This classic essay was originally published in Cognition and Brain Theory, 1984, 7 (3 & 4), 329–357.

About David Kelley:
David Kelley, Ph.D., is the founder of The Atlas Society. He has taught philosophy and cognitive science at Vassar College and Brandeis University. He is the author of The Evidence of the Senses, a treatise presenting the Objectivist view of sense-perception and perceptual knowledge. His other works include The Art of Reasoning, a widely used college logic textbook; A Life of One’s Own: Individual Rights and the Welfare State; Unrugged Individualism; and The Contested Legacy of Ayn Rand, among other works.