What is it?
Psychometrics is a field of study concerned with the theory and technique of psychological measurement. Psychometrics refers to psychological measurement/assessment. Generally, it refers to the field in psychology and education that is devoted to testing, measurement, assessment, and related activities.
The field is concerned with the objective measurement of skills and knowledge, abilities, attitudes, personality traits, and educational achievement. Some psychometric researchers focus on the construction and validation of assessment instruments such as questionnaires, tests, raters’ judgments, and personality tests. Others focus on research relating to measurement theory (e.g., item response theory; intra-class correlation).
What is it used for?
Psychometric Assessment is useful due to the fact that it is evidence based standardized testing that helps outline areas of strengths and weaknesses to either simply evaluate or to help formulate a plan going forward.