Since the dawn of the digital revolution, information technologies have changed the way we live, work, play, and entertain. Designers of IT-based digital technology products play a critical role in ensuring that their designed artifacts are not just beautiful but provide value to their users. Users are increasingly interacting with a digital world. Designing interactions in this new world is a challenging task. The experiences we have when we browse the web, or visit amazon.com, sell/buy stuff on eBay or play amusing games on our mobile cell phones do have a tremendous impact on how we live our lives. Designing information systems is even more challenging.