A Project Team ‘Flood Risk Accra’ consisting of TU Delft and KNUST students (Kwame Nkrumah University of Science & Technology in Ghana), supervised by experts from HKV Lijn in Water and Witteveen+Bos were challenged to develop a methodology for urban flood risk assessment. They used the city of Accra as a case study. They are a very good example of how the use of social media can mobilize a lot of people and ask them to actively participate. Lexy Ratering, one of the participating students, shares the experiences of the team: