The review discusses the challenges and strengths of J. P. Cattell's book on personality psychology. The reviewer, H. J. Eysenck, notes that the book is overly complex due to the use of advanced terminology and concepts before they are explained, as well as the frequent introduction of neologisms. The text's structure, with numbered concepts and "crossroads," also makes it difficult to read. Despite these issues, Eysenck acknowledges the difficulty of compressing a vast amount of theoretical and experimental material into a small space, especially for readers with limited background in scientific methods, mathematics, or statistics. He concludes that only an intelligent and persevering student would fully grasp the content. The review then shifts to Jean Piaget's "The Psychology of Intelligence," a translation of his lectures from 1942. Piaget classifies different accounts of intelligence and develops his own theory, viewing intelligent activity as a form of biological adaptation. He distinguishes between affective and cognitive activities, emphasizing the importance of both in conscious adaptation. Piaget's theory aligns with Herbert Spencer's view of intelligence as a continuous process from basic cognitive and motor skills to higher forms of thought. The review highlights Piaget's hierarchical classification of cognitive processes, which includes pre-symbolic and symbolic stages, and his integration of various cognitive processes into a unified theory. The reviewer suggests that Piaget's theory is closer to the factorist school, recognizing a central factor of intelligence and a hierarchy of specialized abilities. Finally, the review of Samuel A. Stouffer and others' "Measurement and Prediction" discusses the book's detailed research on attitude and opinion measurement, as well as prediction. The first part focuses on questionnaire research and scale analysis, providing valuable insights for those involved in questionnaires. However, the second part on prediction is criticized for its excessive detail and cumbersome terminology. The review notes that while the book offers valuable information on screening psychoneurotics and studying soldiers' post-war plans, it may also provide ammunition for critics due to its detailed and sometimes confusing content.The review discusses the challenges and strengths of J. P. Cattell's book on personality psychology. The reviewer, H. J. Eysenck, notes that the book is overly complex due to the use of advanced terminology and concepts before they are explained, as well as the frequent introduction of neologisms. The text's structure, with numbered concepts and "crossroads," also makes it difficult to read. Despite these issues, Eysenck acknowledges the difficulty of compressing a vast amount of theoretical and experimental material into a small space, especially for readers with limited background in scientific methods, mathematics, or statistics. He concludes that only an intelligent and persevering student would fully grasp the content. The review then shifts to Jean Piaget's "The Psychology of Intelligence," a translation of his lectures from 1942. Piaget classifies different accounts of intelligence and develops his own theory, viewing intelligent activity as a form of biological adaptation. He distinguishes between affective and cognitive activities, emphasizing the importance of both in conscious adaptation. Piaget's theory aligns with Herbert Spencer's view of intelligence as a continuous process from basic cognitive and motor skills to higher forms of thought. The review highlights Piaget's hierarchical classification of cognitive processes, which includes pre-symbolic and symbolic stages, and his integration of various cognitive processes into a unified theory. The reviewer suggests that Piaget's theory is closer to the factorist school, recognizing a central factor of intelligence and a hierarchy of specialized abilities. Finally, the review of Samuel A. Stouffer and others' "Measurement and Prediction" discusses the book's detailed research on attitude and opinion measurement, as well as prediction. The first part focuses on questionnaire research and scale analysis, providing valuable insights for those involved in questionnaires. However, the second part on prediction is criticized for its excessive detail and cumbersome terminology. The review notes that while the book offers valuable information on screening psychoneurotics and studying soldiers' post-war plans, it may also provide ammunition for critics due to its detailed and sometimes confusing content.