Alessio Siniscalchi - Citizen Science: Tracking Aliens with Python! The talk discusses the challenges of implementing a Citizen Science Paradigm in a Python-centric platform, and the solutions devised for the System for observation and monitoring of Marine Alien Species, currently used by the italian Institute for Environmental Protection and Research (ISPRA). "Alien" Species means species introduced into a natural environment where they are not normally found. Topics includes strategies for crowd-friendly forms, work-flow definition for collected data, choice of the best technologies for its components: app for android devices, web application for citizens and experts, webGIS for data browsing and web services for data exporting.