Introduction: Individual differences and psychometrics -- Part I The essential tools of psychological measurement: The basic components: scales and items -- How assessment measures are made -- Statistics for psychological measurement -- Part II The essential characteristics of psychological measurement: The importance of reliability -- The significance of validity -- Part III Theories and applications of measurement techniques: Theories and measurement of intellectual ability -- Theories and measurement of personality characteristics -- Alternative perspectives: theories and measurement -- Part IV Ethical and professional issues: Best practice in measurement -- Part V Practical skills for measurement of individual differences: How to make a test or questionnaire -- Appendix A: A table of areas under the normal curve.