ABSTRACT
This chapter describes across four sections with topics covered including: intelligence testing, classroom observations, interpretation of material, varying effects of the environment and interviewing techniques. It provides a detailed study of mental development and education in adolescent girls in the 1930’s as well as considering how important it can be to have a psychologist in the classroom. The French psychopathologist, Pierre Janet, attempts to explain such symptoms by the concept of 'lowering of psychological tension'. He maintains that the capacity to concentrate upon what is happening around one, and so behave appropriately, requires a high degree of 'psychological tension', by which he means some kind of mental force which is lowered in quality during sleep, fatigue, illness and so on. Whether a person suffering from introverted emotional tension will choose to give himself an extra good dinner or to go for a brisk walk will probably depend in part upon circumstances.
