ABSTRACT
Illegitimate tasks are tasks that are perceived as unnecessary or unreasonable. They act as stressors and are expected to induce various strains on employees, including motivational strains. In previous studies, only the association between illegitimate tasks and intrinsic motivation was examined. In the present three-wave longitudinal study, the examination was expanded to include the full motivational continuum described in self-determination theory. Structural equation modeling was used to examine both cross-sectional and longitudinal associations between illegitimate tasks and behavioral regulations among Finnish working adults. In addition to intrinsic motivation, illegitimate tasks were observed to also be strongly associated with amotivation and more moderately associated with external regulation, introjected regulation, and identified regulation in the expected directions. In longitudinal analyses, illegitimate tasks were observed to predict an increase in amotivation and a decrease in autonomous motivation; introjected regulation was observed to predict an increase in illegitimate tasks; and autonomous motivation was observed to predict a decrease in illegitimate tasks. Illegitimate tasks and motivation described in self-determination theory may have reciprocal associations over time. Examining other behavioral regulatory styles in addition to intrinsic motivation is recommended.