Pervasive Information Systems constitute an emerging class in the information systems realm motivated by the pervasive (or ubiquitous) computing paradigm. Pervasive computing promises a technological shift away from the desktop computing paradigm towards more ubiquitous forms of computation presence and use. According to Weiser, who envisioned this computing evolution back in 1991, people and environments will be augmented with computational resources that will provide information and services when and where desired in the most acceptable, easy and pleasant way, like a walk in the woods. Today, we observe that this vision gradually becomes a reality through a multitude of pervasive applications taking their position in various real life settings. Nevertheless, the urgency to rush an individual's world with the latest and greatest pervasive technology must be tempered with an understanding of whether the technology serves appropriately his needs. In other words, this technological shift raises issues considering the acceptance of pervasive information systems and hence their success.