Contents: E.R. Hilgard, Foreword. C. Izawa, Introduction, Origin, and Contributors. C. Izawa, R.G. Hayden, Race Against Time: Toward the Principle of Optimization in Learning and Retention. C. Izawa, Efficient Learning: The Total Time, Exposure Duration, Frequency, and Programming of the Study Phase. C. Izawa, Power Behind the Scenes: Hidden Effects of Test Trials Unveiled. D.W. Fendrich, A.F. Healy, L.E. Bourne, Jr., Mental Arithmetic: Training and Retention of Multiplication Skill. M.J. Intons-Peterson, External Memory Aids and Their Relation to Memory. N. Lightfoot, M. Czerwinski, R.M. Shiffrin, On the Automatization of Visual Search. N. Waugh, P. FitzGerald, M.F. Elias, M.A. Robbings, Anxiety and Selective Attention. H.C. Ellis, P.T. Hertel, Cognition, Emotion, and Memory: Some Applications and Issues. T. Umemoto, Music Cognition and Scale Schema. A.S. Galinsky, M-F. Ehrlich, F.I.M. Craik, Aging and Cognition Function: Cross-cultural Studies.