Mobility has both negative and positive facets. On the negative side, mobility introduces new threats (e.g., sparse connectivity, wireless communication eavesdropping). On the positive side, the related notion of locality, when handled correctly, can be beneficial to system design (advantage can be taken of immediate neighbors for saving important data in order to built a distributed backup at the level of successive immediate neighbors). Both facets of mobility need to be studied in the context of resilient ubiquitous systems. Contact: Marc-Olivier Killijian