John Halloran Rahat Iqbal Dzmitry Aliakseyeu Martinez Fernando Richard Cooper Adam Grzywaczewski Ratvinder Grewal Anne E. James Chris Greenhalgh Design Challenges and Solutions: Review of the 4th International Workshop on Ubiquitous Computing (iUBICOM 2009). 234-245 2009 BNCOD http://dx.doi.org/10.1007/978-3-642-02843-4_26 conf/bncod/2009 db/conf/bncod/bncod2009.html#HalloranIAFCGGJG09