Internet based Systems (ISs), in particular those amongst disasters, are expected to function as far as possible and therefore assumed to be as resilient as possible in our society. In fact, the ISs themselves are of the utmost importance and one of the most prerequisite social infrastructures, together with the mass media, which are required to function properly in natural disasters and/or social ones with the social dimensions like earthquakes, tsunamis, fires, terrorism and nuclear accidents, etc. As a particular example, the recent East Japan Earthquake of 3.11 in 2011, together with the subsequent Tsunami and the Fukushima Nuclear Accident, and other concerned disasters have provided us with a huge and the unprecedented social fields, from which we are to analyze the information systems with the social dimensions and thus to learn and improve the internet based systems in our society. Therein the disasters are exactly the situation where the existing social systems are out of order, and therefore the place for us to improve the internet based systems thereupon. The REIS (Resilient Internet Based Systems) workshop thus aims to bring together the informatics researchers which range the related interdisciplinary fields with technological as well as social facets of the issues for the purpose of analyzing and improving the internet based systems resilient, particularly against disasters, in our contemporary society.