Personality is usually broken into components called the Big Five, which are openness to
experience, conscientiousness, extraversion, agreeableness, and neuroticism (or
emotional stability). These components are generally stable over time, and about half of
the variance appears to be attributable to a person's genetics rather than the effects of
one's environment.[13][14]
Some research has investigated whether the relationship between happiness and
extraversion seen in adults can also be seen in children. The implications of these findings
can help identify children that are more likely to experience episodes of depression and
develop types of treatment that such children are likely to respond to. In both children and
adults, research shows that genetics, as opposed to environmental factors, exert a greater
influence on happiness levels. Personality is not stable over the course of a lifetime, but it
changes much more quickly during childhood, so personality constructs in children are
referred to as temperament. Temperament is regarded as the precursor to personality.
[15] Whereas McCrae and Costa's Big Five model assesses personality traits in adults, the
EAS (emotionality, activity, and sociability) model is used to assess temperament in
children. This model measures levels of emotionality, activity, sociability, and shyness in
children. The personality theorists consider temperament EAS model similar to the Big Five
model in adults; however, this might be due to a conflation of concepts of personality and
temperament as described above. Findings show that high degrees of sociability and low
degrees of shyness are equivalent to adult extraversion, and also correlate with higher
levels of life satisfaction in children.