This paper reviews existing data platforms to help identify a technology blueprint for a multi-disciplinary citizen science platform focused on data collection and sensor input aggregation and visualization. Abstract. With funding from the Alfred P. Sloan Foundation, Azavea worked with partner, SciStarter, to investigate the latest developments in software, hardware and data processing capability as it applies to citizen science. The results of this research are assembled in this four-part report. The first part, Data Collection Platform Evaluation, examines existing online software platforms designed to support citizen science. The second, Technology Evaluation, describes recent technology related to sensors, data collection and data visualization. The last two parts include a set of user interface designs for a future citizen science data collection platform and the results of testing cloud computing platforms for geospatial data processing performance.