High job demands (i.e., workload, time pressure) can be detrimental to employee strain and workplace performance. Theories of occupational stress (e.g., Karasek’s job demand control model) have been developed which highlight the role of job control as a buffer against the negative effects of job demands. However, past research has largely produced mixed findings for the stress-buffering effects of control. This thesis investigated whether trait self-control moderates the effect of task control on strain and performance, and whether this relationship is mediated by task self-regulation difficulty. It was predicted that individuals high in trait self-control would experience less strain and perform better under high task control (as opposed to low task control) because it reduces their difficulty to selfregulate in the heat-of-the-moment. Conversely, high task control (as opposed to low task control) was predicted to increase strain and reduce performance for low self-control individuals as it increases task self-regulation difficulty. Ninety-seven students from The University of Queensland first completed an online survey which assessed demographics and trait self-control, and in a separate session completed a demanding emailing task in a simulated workplace. Strain (i.e., anxiety, fatigue and cortisol) and performance (i.e., number of emails completed and average quality of emails) were used as dependent measures. Contrary to predictions, high control did not attenuate strain or increase performance for those with high trait self-control, with the exception of reducing duringtask fatigue. However, high control did exacerbate strain and lower performance for low trait self-control participants both directly on during-task fatigue and the number of emails completed, and indirectly through task self-regulation difficulty on during-task anxiety, fatigue, as well as the average quality of emails. These results are explained, along with their theoretical and practical implications. Directions for future research are also provided which may help to extend findings from the current research.