Book excerpt: As a conceptual framework for the investigation of human memory, the levels-of-processing paradigm had enjoyed immense popularity since its introduction in the early 1970s. It was the impetus behind literally hundreds of experiments and was used as an "explanation" for a wide range of retention phenomena. Consequently, a wealth of data and theory had emerged, and this title assimilates and evaluates this information. Originally published in 1979, the distinguished contributors to the volume – both proponents and opponents of the levels-of-processing framework – present here their latest data and ideas on a viewpoint that has been a tremendous influence in memory research and related areas.