Many years ago, research in this field of birth orderyields an inconsistent and sometimesargumentative conclusion. Researchers in this field wanted to know ifthe birth order has an impact on a person’s personality traits and socialdevelopment due to the research of Adler. Most scientists and researchersacknowledge that a child’s overall development is shaped and formulated byvariables within the home environment, such as quality of parenting, and theresources which are readily made available to the family (Downey, 2001).Further study, it results that it also considers the family size that canaffect the education outcomes is the number of siblings in the family (Downey,2001). Furthermore, this study wants to find out if the personality andacademic performance can affect a person based on their birth order. A family is composed of a father, mother and children. Birth orderrefers to the person’s position in his or her family. In a family, childrenwould learn the most basic things, including what is valuable and meaningful totheir parents and siblings for various roles before they find their personalposition or role in the family.

In terms of personality traits of a person,she/he developed it by nature or biologically inherited.  This is still debatable today, but researchercontinues to find the evidence. According to Austrian psychologist Adler (1937), he was the one who establishes this theory, it is stated thatchanging the condition that a family is the main cause of discredited thetheory.

It showed that birth order is the main factor to a person’s emotional,physical, and intellectual development. Adler (1937) also the one who sees that birth order influence a person’s personalitytraits. What is the connection of academic performance to personality traits? Accordingto Costa & McCrae (1992), suggests that personality traits can affect theacademic performance. Therefore, in this study, the researchers try toinvestigate the impact on personality to academic performance of a person thatbase on birth order.