Knowing yourself and your partner: Accuracy of personality judgment in recently cohabiting couples.

= 25.41 years) who participated in a preregistered experience-sampling study, providing up to 50 personality-state assessments over 10 days. The findings from multilevel models supported previous knowledge on intrapersonal perception and significantly expanded the knowledge on interpersonal perception. Specifically, the findings suggested the most robust pattern for conscientiousness and neuroticism, ascribing these Big Five domains a significant role among recently cohabiting couples. Interestingly, accuracy was not enhanced among more satisfied couple members, but it was largely facilitated when partners were exclusively together as a couple (vs. with other people). Overall, this research shows that the use of multiple sources allows for a more comprehensive understanding of personality, especially when the aim is to understand the accuracy of personality judgment in couples. (PsycInfo Database Record (c) 2025 APA, all rights reserved).