Crowd Work is a phenomenon of the digital economy as well as the modern IT era. It provides a great potential for changing the way how businesses create value. As a result, organizations increasingly apply crowd work to reach out to their own employees ("Internal Crowd Work") or individuals outside the company boundaries ("External Crowd Work") to outsource certain tasks. However, the individual crowd workers perspective has been neglected within this new form of digital gainful employment. Therefore, this dissertation addresses the perception of internal as well as external crowd work and...