Personality development in emerging adulthood: integrating evidence from self-ratings and spouse ratings.

The authors examined self-ratings and spouse ratings in a young adult newlywed sample across a 2-year interval. Rank-order stability correlations were consistently high and did not differ across the 2 types of ratings. As expected, self-ratings showed significant increases in conscientiousness and agreeableness--and declines in neuroticism/negative affectivity--over time. Spouse ratings yielded a very different pattern, however, showing significant decreases in conscientiousness, agreeableness, extraversion, and openness across the study interval. Spouse ratings also showed evidence of a "honeymoon effect," such that they tended to be more positive than self-ratings at Time 1. This effect had dissipated by the 2nd assessment; in fact, the spouse ratings tended to be more negative at Time 2. Analyses of individual-level change revealed little convergence between self- and spouse-rated change, using both raw change scores and reliable change index scores. Finally, correlational and regression analyses indicated that changes in spouse ratings were significantly associated with changes in marital satisfaction; in contrast, changes in self-ratings essentially were unrelated to marital satisfaction. These results highlight the value of collecting multimethod data in studies of adult personality development.