The workshop will focus on reference architectures and AAL middleware. Many projects have in the last few years developed AAL runtime environments and middleware solutions that aim at being reusable “AAL operating systems”. This workshop will try to summarize the state of the art in AAL middleware and discuss whether a standardization of an AAL “reference architecture” is needed, and on which levels (e. g. reference model, system architecture, APIs, terminology/ontology). Representatives of the most important middleware projects and products, including universAAL, URC, OpenHAB, IP-Symcon, OpenRemote, MundoCore and others are invited.