Natural communication with machines or with other people via machines is critical to bring the benefits of networked computers to mass markets. The user interface of the computer must cater to the human senses of sight, sound and touch, which we humans use to navigate our physical surroundings. The challenge is learning how to integrate these still imperfect technologies to combine modes of human-computer interaction and achieve synergies that transcend the benefit of a single modality. Make the interface really human centered, arranging the interface such that the users are provided with the necesary feedbacks and the least perplexity. Such that the user can input Chinese most effectively and efficiently even with the imperfect PinYin to Chinese conversion engine.
Output can also include a usability guide.
Details will depend on usability study.