This (1949) study, he used the Five-Factor Model where

study is supported by the theory of Adler (2013) which is the Individual
Theory. There are several theories on the study regardless of the birth
order that will anchor by the researcher. In these theories will include
the ‘Family Constellation’ and ‘Early Recollection’ (Adler, 2013). Adler (1931)
stated that the firstborn or only child
has a unique position in the family, and being the only child for the family
has a lot more different from the first child, in terms of their experiencing a
traumatic dethronement of a younger sibling is born. It will be a dramatic view of the family situation. He also stated
when the first baby brother or sister is
age 3 or more, they incorporate this dethronement into a previous effect of lifestyle in the family. One of this is, they
were more likely fell a hostility and resentment forward the new baby or
siblings. Some of it, if the first baby born is
less than 3 years old, their hostility and resentment will be largely
unconscious, which makes these kinds of attitude more resistant to change in
later or daily life.

on the study of Adler (2013) which state that the second children or middle
will begin their life in a better situation than to the first children, it
would be developed a cooperation and social interest in the society. The second
child is extremely hospitable and vengeance, it may also become a highly competitive with the first born and it
would easily to discouraged. The youngest child is more likely to have a strong
feeling of inferiority and lack of
competence. Usually, the youngest baby
should have pampered is one of the worst behavior of parents that can cause a selfishness as well as irresponsibility
when the time comes and the youngest enter adulthood.

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            In addition, another theory that
support in this study is the Big Five Personality Trait or the Five-Factor
Model that developed by McCrae and Costa. In Fiske (1949) study, he used the
Five-Factor Model where he was the one who published this model. Many
researchers was also tested this theory. However, all those theories that had
been link to this model, not everyone agrees to it. This time, McCrae and Costa
(1985) developed the five traits along with the test tools, those are the
following: Openness (closed experience), Conscientiousness (lack of
consciousness), Extraversion (Introversion), Agreeableness (Disagreeableness),
and Neuroticism (emotional stability) or the OCEAN.

            Openness are those people who like
to learn new things and enjoy new experience usually score high in openness
includes traits like being insightful and imaginative and having a wide variety
of interests. Next, Consciousness, people who are high score in this are reliable
and prompt traits include being organized, methodic, and thorough. Extraversion,
those people who is high in score in this area are sociable, extroverts get their
energy from interacting with others, while introverts get their energy from themselves.
Extroverts includes the traits of being energetic, talkative, and assertive. Agreeableness,
those individuals who are highest in this area  are friendly, cooperative, and compassionate. Those
who got low in this area are more distant. Traits includes being kind, affectionate,
and sympathetic. Lastly, Neuroticism, is also called Emotional Stability. This dimension
relates to one’s emotional stability and degree of negative emotions. Individuals
who got higher score on neuroticism often experience emotional instability and negative
emotions. Traits include being moody and tense.

            Another theory of Multiple Intelligence by Howard Gardner (1991), in his theory support this study
to know and identified the seven types of multiple intelligence. According to Gardner
(1991), he stated that everyone are able to know the world through language, logical-mathematical
analysis, spatial representation, musical thinking, the use of the body to solve
problems or to make things, an understanding of other individuals, and an understanding
of ourselves. He added that everyone of us has different in strength of those intelligences
in which such intelligence are invoke and combine to carry out  different task, solving problems, and progressive
in various domains. This would determine a person’s strength when in terms of intelligence,
or in what area he/she would get a higher score. In this theory, it may help us
to know more about our skills and intelligence.