Self-concordant work motivation arises from one's authentic choices, personal
values, and interests. In the present study, we investigated whether
self-concordant motivation may fluctuate from one work-related task to the next.
On the basis of self-determination theory, we hypothesized that momentary
self-concordance buffers the negative impact of momentary work demands on
momentary happiness. We developed a modified version of the day reconstruction
method to investigate self-concordance, work demands, and happiness during
specific work-related tasks on a within-person and within-day level. In total,
132 teachers completed a daily diary on three consecutive work days as well as a
background questionnaire. The daily diary resulted in 792 reported work
activities and activity-related work demands, self-concordance, and happiness
scores. Multilevel analysis showed that-for most work activities-state
self-concordant motivation buffered the negative association of work demands with
happiness. These findings add to the literature on motivation and well-being by
showing that the levels of self-concordance and happiness experienced by
employees vary significantly on a within-day level and show a predictable
pattern. We discuss theoretical and practical implications of the findings to
increase employees' well-being.