Identity formation is one of the key developmental tasks in adolescence. According to Erikson (1968) experiencing identity uncertainty is normative in adolescence. However, empirical studies investigating identity uncertainty on a daily basis are lacking. Hence, studying individual differences in daily certainty (i.e., identity commitment levels)…

A diverse sample of 1,143 high school seniors and 182 students who were part of the same cohort but who left high school without graduating were interviewed during late adolescence (Time 1 [T1]) as well as 2 (Time 2 [T2]) and 4 years later (Time 3 [T3]). Perceived self-development, peer support, and prior levels of depressive symptoms (T2) were…