This work highlights the importance of informal control modes on software platforms regarding their positive effects on third-party developers’ behaviors and outcomes. The author presents studies in the mobile software industry, demonstrating how self-control and clan control positively affect developers’ outcome performance, app quality and intentions to stay on software platforms. Moreover, the studies’ findings shed light on the underlying explanatory mechanisms of why informal control modes can be exercised effectively on software platforms and how especially clan control may be facilitated through developers’ social capital. Contents Mobile Application Quality and Platform Stickiness under Formal vs. Self-Control – An Experimental Study Informal Control Modes and the Mediating Role of Third-Party Developers’ Intrinsic Motivation Social Capital and Clan Control to Enhance App-Developers’ Performance and Success Target Groups Researchers and students in the field of information systems, computer science and business Practitioners like IT-managers and platform providers in the software industry The Author Tobias Goldbach wrote his dissertation at the Chair of Information Systems and E-Services at the Technische Universität Darmstadt, Germany.