We examined the correspondence between the structure of act-report data and 5-factor models emerging from trait-rating data. Twenty categories were selected as markers for the 5-factor model and retrospective act reports were constructed for the target categories. One hundred eighteen men and women comprising 59 dating couples completed self-based and observer-based act reports. Several factor analyses tested different assumptions. Retaining total act performance (TAP) produced a blend of the traditional 5 factors. Removing TAP closely reproduced the 5-factor model in both principal-components and procrustes analyses. Correlations between the derived act factors and trait ratings from 6 data sources support a reinterpretation of the traditional trait labels. Discussion focuses on the implications of different assumptions on the formulation of a basic model of personality structure.