The phrase "Human Interface" has suddenly become part of the lexicon of the technology industry. At its most basic level, this phrase is used to describe not only the aesthetics of a device, but, more importantly, the process by which a device responds to human interaction. While not a new concept, the availability of enabling technology that can revolutionize the way we interact with consumer electronics products and an urgency to incorporate this technology demonstrates the increased importance consumers are placing on interface design. What defines good human interface design, and how can system designers implement a smarter, friendlier and more intuitive solution? To begin answering these questions, it is helpful to view a human interface simply as a set of functional interactions with end users and their surroundings. These interactions can be subdivided into two logical groupings: inputs and outputs.