To better understand personality development, we tested how personality manifests and develops along the actor, agent, and author (Bühler, Weidmann, & Grob, 2020), and examined the content, processes, and outcomes of life goals across the life span (Bühler, Weidmann, Nikitin, & Grob, 2019). Moreover, we studied personality development in romantic relationships (Bühler, Finkenauer, & Grob, 2020; Bühler, Weidmann, Kumashiro, & Grob, 2019; Bühler, Finkenauer, & Grob, 2020), and explored relationship processes that underlie personality development in romantic couples (Bühler, Weidmann, Wünsche, Burris, & Grob, 2020).

To gain insights into relationship development, we compiled and systematically evaluated data from more than 165,000 people aged 20 to 76 in relationships spanning from 3 months to 46 years in length (Bühler, Krauss, & Orth, 2021). Moreover, we discussed how people approach, organize, and maintain their social relationships (Bühler & Nikitin, 2020), and used narrative diagnostics and methodologies to better understand relationship development (Bühler & Dunlop, 2019; Bühler, Maghsoodi, & McAdams, 2017; Dunlop, Bühler, Maghsoodi, Harake, Wilkinson, & McAdams, 2020).