Extended KLM for mobile phone interaction: a user study result

Facing with the fast development of mobile phones, the designers need to evaluate user performance for early responding to the potential interaction problems. Previous studies show that the original Keystroke-Level Model (KLM) has been successfully used in conventional computer-based interaction design. However, with the emphasizing of the next-generation design and new interactions in mobile phones, the existing KLM cannot fulfill all range of mobile-based tasks. This research aims to present discussions on extending KLM for mobile phone interaction. In addition to the basic operators in conventional KLM, another fourteen new operators and a new concept - operator block were proposed. This extended KLM will help designers to reach a full-fledged user performance model for mobile phone interaction.

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