Kennon M. Sheldon et al. (1996)
Diary study shows daily autonomy and competence predict better day-to-day well-being, beyond stable trait differences.
Using daily diary data, the study links self-determination theory needs to everyday well-being by showing that both trait levels and day-to-day fluctuations in autonomy and competence relate to having “better” days. It adds evidence that well-being is not only shaped by stable personality differences but also by whether people feel effective and self-directed in their activities that day. The findings position need satisfaction as a positive source of daily well-being, complementing prior diary work focused on stressors and threats. This supports interventions that target daily experiences of choice and effectiveness, not just global traits.
Daily diary study analyzing both between-person (traits) and within-person (day-to-day deviations) predictors of well-being.
Basic self-determination theory (autonomy, competence) and familiarity with within-person vs between-person analysis in psychology.