Alexandra Michel, Clarissa Gross, Annekatrin Hoppe, M. Gloria González-Morales, Deidre O'Shea, Anna Steidle

• Positive psychology research is increasingly being transferred to organizational contexts and organizations are increasingly striving for healthier and more motivated employees. In this study, a three-week self-instructed online-intervention which combines positive activities and mindfulness was developed and evaluated using a randomized-controlled group design with employees. All exercises could be easily integrated into the daily working routine. The intervention is based on broaden-and-build theory, the two-component model of mindfulness and the positive-activity model. Results indicate that the intervention is effective in increasing work engagement, hope and sleep quality as well as in reducing fatigue in the experimental group compared to a waitlist control. Practical implications for human resource departments and corporate health management are discussed.