'Personality,' in psychological terms, refers to personal ways of thinking, feeling, and behaving which are characteristic of the individual. These aspects of personality may be both genetically determined and learned in the formative years. Even before any primitive personality characteristics may be recognized, it is evident that infants have various needs which must be satisfied to ensure their well-being. Abraham Maslow has identified five main types of important human needs: physiological needs, safety needs, belongingness and love needs, esteem needs, and need for self-actualization. Maslow believes these needs appear in hierarchical form. The individual's comprehension or interpretation of the world may be understood in terms of beliefs, attitudes, and values. Beliefs are non-evaluative understandings of the nature of things. Attitudes are a person's 'feelings' and beliefs about a particular thing, person, or idea. Values are abstract ideas specifying what is good and desirable as opposed to what is bad and undesirable. Esteem needs of a person will be increasingly satisfied the more the person is able to generate a positive self-evaluation. Understanding the foregoing concepts of personality, needs, values, beliefs, and attitudes can help police in interviews and interrogations. They also apply to how various officers will make discretionary decisions and how officers will evaluate themselves and one another in their performances. An officer's understanding of himself/herself is enhanced through a knowledge of human behavior, an understanding which can improve the effectiveness with which one manages his/her own life. Twenty-one notes and six references are provided.