The main aim is to introduce students to the analysis of substances in test development. Then Introduce students to some of the tests used in different areas (intelligence, personality, projective) and to inform them about the various measurement principles and problems in the test development phases. Also provide the students with knowledge and skills about test development processes. Psychology and measurement relationship. Science philosophy and measurement. Psychometric properties of psychological tests. Validity and reliability in psychological tests, new approaches to test development.