Psychometrics is a field of study concerned with the theory of measuring mental abilities, skills and processes. Key insights in traditional test theory are reliability and validity. There are many types of psychometric tests, but most of them are objective tests envisioned to measure knowledge, attitudes, educational achievement, or personality qualities. Research includes two key tasks, the construction of instruments and the development of procedures for measurement. there is additional part of psychometrics that deals with statistical research on the measurements that psychometric tests are attempting to attain. Standards of quality is done in two steps, they are testing standards and evaluation standards.