Published in 1980, part of the Experimental Psychology series. This book proposes and tests a theory about human memory, about how a person encodes, retains, and retrieves information from memory. This edition contains two major parts. First is the historical analysis of associationism and its countertraditions. This still provides the framework that has been used to relate the current research to an important intellectual tradition. This is reproduced without comment from the original book; historical analyses do not need as rapid revision as theoretical analyses. The second part of the book reproduces the major components of the HAM theory.