Abstract
Certain applicat ions (e.g web browsing, email etc.) in Television (TV) demand for text entry by the user in a similar fashion as done in co mputers. User experience p lays a majo r role in the success of such applications. This paper discusses about an on-screen keyboard with hierarchical character or sym bol organization which is operated by an accompanying remote control to allow navigation with reduced number of key strokes. The keyboard has been designed for Television and set top box users. It enhances user experience by allowing users to type easily and quickly. It also reduces cost by eliminating the need for a separate physical keyboard. This work has adopted iterative design cycles, where users' feedback arecollected and analysed in each cycle, and those have led to user-driven usability imp rovement. As the main contribution in this paper, we present a methodology for evaluating different on-screen keyboard layouts for telev ision and set-top box users. In order to do this we have extended and applied KLM-GOMS model. Lastly we have incorporated predictive text entry technique with the proposed layout. We have extended the KLM-GOM S model further to include a new parameter called dynamic mental operator(DM) which takes into account the additional cognitive load on the users while using predictive text entry techniques.
Highlights
The world is witnessing phenomenal convergence in terms o f content, access technology and access device
The characters per minute (CPM) values were calcu lated for each user and were p lotted for both standard QWERTY onscreen keyboard and for this new layout
Based on cognitive models, it is found that the improvement of the layout shown in fig 1 over QWERTY layout is approximately 45.75% and that for the layout shown in fig 2 over QW ERTY is 46.75%
Summary
The world is witnessing phenomenal convergence in terms o f content, access technology and access device. Several categories of contents like voice, data and mu ltimed ia content can be converged on and accessed on the same device. Content from mu lt iple applicat ions including voice call, video call, television program, Internet, video conference, short message service and instant message can be accessed using a single access device which can be desktop computer, laptop computer, mobile phone, PDA, Television, Set Top Bo x or any suitable device. Television screens are usually b igger than some of the access device screens like mobiles / tablets and this makes it ideally suitable for accessing wide range of applications and content. It is even possible for people to browse Internet from the TV through use of suitable Set Top Bo x o r other enabling devices[24]
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