A psychological test is essentially an objective and standardized measure of a sample of behavior. Psychological tests are like the tests in any other science, insofar as observations are made on a small but carefully chosen sample of an individual's behavior. In this respect, the psychologist proceeds in much the same way as the biochemist that tests a patient's blood or a community’s water supply by analyzing one or more samples of it. In this book, I have attempted to make readers familiar with the concept of Psychological and Psychometric testing and an introduction to various tests like THE BIG FIVE PERSONALITY DIMENSIONS, FUNDAMENTAL INTERPERSONAL RELATIONSHIP ORIENTATION-BEHAVIOUR, Myers-Briggs Type Indicator, The DISC Personality Model, 16PF, Johari Window etc.