This first book by German-born psychologist Hans Jürgen Eysenck's is considered a classic amongst scholars and professionals of psychology. It describes the pitfalls of psychology, and the remedies that can be applied. A strong dependence on statistics and the experimental method is emphasized as essential to good psychology. The book is divided into four sections: Intelligence Testing, Vocational Psychology, Abnormal Behaviour, and Social Attitudes. Can an intelligence test administered to an eight year old predict adult performance? Is interviewing a good way of selecting the best applicant for a job? Is there such a thing as 'normal' behaviour? Can surveys such as the Gallup poll be of assistance to psychologists? Eysenck answers these and other questions. A book not to be missed by anyone interested in psychology.