For about a decade, academic psychology finds itself in a crisis. Replication of the vast majority of research findings fails, the field is plagued by a bewildering methodological sloppiness and several cases of outright fraud surfaced. This book argues that one of the major causes of the crisis in psychology often goes unnoticed and is situated at the level of measurement methods. While the method sections of myriads of research papers claim that the validity of the measurement instruments u...