Do you know how much of your personality is a result of your genetic makeup and how much is a result of environment? The “nature-nurture” question is one of the oldest questions in psychology. This question applies to identical twins. They are the same age, the same gender, have the same genes, live in the same house, share the same things, receive identical gifts, so in other words, they have shared the same environment since birth. The researcher is trying to find out if identical twins really share the same personality. In Alfred Adler's individual psychology, each person is an integrated whole, striving to achieve future goals and attempting to find meaning in life while working in harmony with others. There are four areas of individual psychology, Family Constellation or the position of an individual in a family with respect to birth order among siblings, gender and age, presence or absence parents. The second area of ​​individual psychology is early memories, which involves reconstructing memories that produce clues to understanding a person's lifestyle. It is always consistent to produce clues to understand both the end goal and the current lifestyle. The third area is that of dreams. For Adler, it provides clues to the problem. Finally, the fourth area is psychotherapy. The goal of Adlerian psychotherapy is to improve courage, reduce feelings of inferiority, and encourage social interest. Another theory related to research is the analytical theory of Carl Gustav Jung. According to this theory, occult phenomena can and do influence everyone's life. The analytical vision of individuals is fundamentally motivated by archetypes inherited from ancestors which form a collective unconscious. This is the result......in the middle of the article......there are traits that are less omnipresent but still a fairly generalized arrangement and finally Secondary are traits that are more specific and narrower dispositions . Finally, the biological theory of Hans Eysenck also associated with this research. This theory focuses more on physiology and genetics. Eysenck considers personality differences to arise from genetic inheritance. In this theory, there are three (3) fundamental dimensions of personality. These are extroversion-introversion (calm people vs extroverts), neuroticism (a dimension that ranges from normal, fairly calm and serene people to those who tend to be quite nervous) and psychotism (high psychoticism does not mean not that a person is psychotic, the individual only exhibits certain qualities commonly found in psychotics). Works CitedAsk.com, Personality Psychology by dr. Roxel Apruebo, Personality by Jerry M. Hamburger