The article focuses on user interfaces. Human-computer interaction has not changed fundamentally for nearly two decades. Most users interact with computers by typing, pointing and clicking. The majority of work in human-computer interfaces in recent decades has been aimed at creating graphical user interfaces that give users direct control and predictability. These properties provide the user a clear model of what commands and action are possible and what their affects will be, they allow users to have a sense of accomplishment and responsibility about their interactions with computer applications. Although these endeavors have been very successful and windows, icons, menus, pointer paradigm has served to provide a stable and global face to computing, it is clear this paradigm will not scale to match the myriad form factors and uses of computers in the future. Computing devices are becoming smaller and ubiquitous, and interaction with them is becoming more and more pervasive in daily lives.