The predictive power of the Big Five personality traits extends to satisfaction in romantic relationships. Recent research demonstrates that personality trait levels may predict relationship quality in dating, engaged, and married couples via measures of the Big Five, self-reported measures of personality traits and relationship quality by participants in romantic relationships, partner-reported measures of participating partner's personality traits and relationship quality, physiological measures, and ratings of relationship quality by a qualified observer.
Self-reported relationship quality is positively related to self-reported Conscientiousness
Self-reported Agreeableness is positively related to others' ratings of relationship quality
Partner-reported Neuroticism is negatively related to self-reported quality and positively related to Conscientiousness
Self-reported relationship quality was higher among those high in Extraversion and Conscientiousness
Observers rated the relationship quality higher if the participating partner's self-reported Extraversion was high
High self-reported Neuroticism, Extraversion, and Agreeableness are related to high levels of self-reported relationship quality
Partner-reported Agreeableness is related to observed relationship quality.