First published in 1975, A Cognitive Theory of Learning provides a history of hypothesis theory (H theory), along with the author’s research from the previous decade. The first part introduces the reader to contributions of some major learning theorists. It traces the history of H theory, reviewing the confrontation with conditioning theory, with the stress on the emergence of H theory which came to predominate. The second part describes the author’s work, presented as it emerged over time. It shows how the outcome of one experiment typically led to the next theoretical development or experiment. Originally part of The Experimental Psychology Series this reissue can now be read and enjoyed again in its historical context.