Online participation platforms (OPPs) are frequently used by public institutions to involve citizens in political opinion forming and decision making. A literature re-view reveals different approaches to evaluate these OPPs. These approaches focus only on partial requirements of participation processes. In this research in progress, we develop and pretest an interdisciplinary literature-based requirement frame-work. It includes the categories usability, security, information, transparency, inte-gration, and mobilisation. Our aim is to close the research gap of a context-specific analysis and evaluation of OPPs