This course focuses on the theory of psychometric instruments and their use. Psychometrics is the field of study concerned with the theory and technique of educational and psychological measurement, which includes the measurement of knowledge, abilities, attitudes, and personality traits. The field is primarily concerned with the study of differences between individuals and between groups of individuals. It involves two major research tasks, namely: (1) the construction of instruments and procedures for measurement; and (2) the development and refinement of theoretical approaches to measurement.