Research at the Chair of Developmental Psychology focuses on individual differences in cognition, subjective well-being, and social relationships across the entire lifespan, with an emphasis on adulthood. We use micro- and macro-longitudinal research methods to investigate differential developmental processes across various time scales. Our research examines development on multiple temporal levels: from cohort differences that unfold over decades, to individual differences in multi-year macro-longitudinal trajectories, to intensive micro-longitudinal processes spanning days or even hours. We study the interplay between individual differences in long-term developmental patterns and everyday functioning to gain new insights into developmental processes across the lifespan.