The reviewer criticizes Cattell's book for using complex terms and neologisms without explanation, making it difficult for beginners. The author's use of numbered concepts also complicates the text. The reviewer suggests that the difficulty stems from the subject's complexity rather than the author's skill. The book attempts to condense vast theoretical and experimental material into 230 pages, which is challenging, especially for readers without prior knowledge of scientific methods. Despite this, the reviewer acknowledges Cattell's effort but doubts that only highly intelligent students will benefit. Piaget's book is a translation of lectures on intelligence. He classifies different theories of intelligence, emphasizing that intelligence is a form of biological adaptation. He distinguishes between affective and cognitive aspects of intelligence, arguing that intelligence involves both energy and structure. Piaget's theory aligns with Spencer's, emphasizing the continuity of cognitive and motor adaptation. He outlines stages of cognitive development, including pre-symbolic and symbolic stages. His theory is compared to the factorist school, particularly Spearman, though Piaget's view is more aligned with later factorists who recognize a hierarchy of abilities. Piaget's work synthesizes various psychological theories and is recommended for specialists. Stouffer's book is the fourth in a series on social psychology during WWII. It details research underlying previous observations and analyzes measurement and prediction. The first part discusses questionnaire research and scale analysis, which are valuable for attitude measurement. The second part, on prediction, is criticized for excessive detail and complex terminology. While the book provides detailed information on psychological testing, its arguments are sometimes unclear. The reviewer notes that the book is dense and may be challenging for readers without specialized knowledge.The reviewer criticizes Cattell's book for using complex terms and neologisms without explanation, making it difficult for beginners. The author's use of numbered concepts also complicates the text. The reviewer suggests that the difficulty stems from the subject's complexity rather than the author's skill. The book attempts to condense vast theoretical and experimental material into 230 pages, which is challenging, especially for readers without prior knowledge of scientific methods. Despite this, the reviewer acknowledges Cattell's effort but doubts that only highly intelligent students will benefit. Piaget's book is a translation of lectures on intelligence. He classifies different theories of intelligence, emphasizing that intelligence is a form of biological adaptation. He distinguishes between affective and cognitive aspects of intelligence, arguing that intelligence involves both energy and structure. Piaget's theory aligns with Spencer's, emphasizing the continuity of cognitive and motor adaptation. He outlines stages of cognitive development, including pre-symbolic and symbolic stages. His theory is compared to the factorist school, particularly Spearman, though Piaget's view is more aligned with later factorists who recognize a hierarchy of abilities. Piaget's work synthesizes various psychological theories and is recommended for specialists. Stouffer's book is the fourth in a series on social psychology during WWII. It details research underlying previous observations and analyzes measurement and prediction. The first part discusses questionnaire research and scale analysis, which are valuable for attitude measurement. The second part, on prediction, is criticized for excessive detail and complex terminology. While the book provides detailed information on psychological testing, its arguments are sometimes unclear. The reviewer notes that the book is dense and may be challenging for readers without specialized knowledge.