Sustainability of Open Educational Resources: the eCity case

[EN]The promotion of Open Educational Resources (OER) as reusable tools for teachers and students is highly relevant but the nature of the income model requires specific strategies to maintain and update those resources. eCity is a city simulation game that supports a Problem Based Learning (PBL) pedagogical methodology in secondary schools and, at the same time, fosters the interest of students in following an Engineering career. The game is freely available through online stores and the generated interest (about 100.000 downloads so far) has raised the need to discuss and adopt a sustainability strategy for the maintenance of the game and the development of new versions. This article presents possible alternatives for that strategy