A lot has changed since smartphones and tablets became popular (?) devices. In the beginning those devices were primarily considered for communication purposes and beyond that merely occasional and casual interactions. This has changed in the last decade, mobile, handheld devices have become an important cornerstone of our modern information architecture. The applications have extended to business, research, disaster management, sensor networks, and many other fields. There are many indicators that illustrate these developments: google queries from mobile devices have exceeded desktop queries, in some countries we are already speaking about mobile first countries.
This ongoing trend confronts us as designers, researchers and developers with new challenges.