Personality

Openness

Conscientiousness

Extraversion o extroversión

Agreeableness

Neuroticism

“While there are many different theories of personality, the first step is to understand exactly what is meant by the term personality. The word personality itself stems from the Latin word persona, which referred to a theatrical mask work by performers in order to either project different roles or disguise their identities.”

“It has been shown that personality traits are more malleable by environmental influences than researchers originally believed. Personality differences also predict the occurence of life experiences.”

http://en.wikipedia.org/wiki/Personality
http://psychology.about.com/od/psychology101/u/psychology-theories.htm
http://www.humanmetrics.com/hr/you/personalitytype.aspx
http://www.16personalities.com/personality-types
http://www.personalitypage.com/html/relationships.html
http://psychology.about.com/od/overviewofpersonality/a/persondef.htm
http://en.wikipedia.org/wiki/Neuroticism
http://www.thefreedictionary.com/personally