Abstract
Through mathematics, this paper works to analyse the Index of Difficulty in ISO9241-Part 411: Evaluation methods for the design of physical input devices. It was proven that all the target circles always intersect for very low Index of Difficulty; which conjectured to disturb the experiment or affect the focus of the subject. Some examples are provided, in addition, to support the proof. We hope this proof will contribute to the improvement of ISO9241, where the result might become a special attention to the designer of the experiment in human-computer interaction field; especially in checking the influence of overlap area in the human factor.
Highlights
The existence of ISO standard helps the researchers in evaluating pointing devices
In 2012, ISO published ISO/TS 9241-Part 411 that named Ergonomics of human-system interaction: Evaluation methods for the design of physical input devices. This standard helps the researchers to adopt a uniform measurement and avoid the bias of the results; establish procedures of testing for evaluating pointing devices created by different companies
Norman and Norman [1] compared the characteristics of remote pointing devices, i.e. relative versus absolute pointing devices; as an evaluating criterion instrument, they used ISO 9241-9
Summary
In 2012, ISO published ISO/TS 9241-Part 411 that named Ergonomics of human-system interaction: Evaluation methods for the design of physical input devices This standard helps the researchers to adopt a uniform measurement and avoid the bias of the results; establish procedures of testing for evaluating pointing devices created by different companies. All of these previous papers used ISO 9241 as a basis for evaluating the performance of pointing devices Based on these works, ISO has become the attention of the researchers; which make the importance of ISO as the measuring standard is undeniable. A problem emerges when a very low range is applied in circular order for multi-directional tapping task; the issue is the appearance of intersection area between targets circles By cause of this overlapping, it seems ambiguous which target to be reached; it is surmised that the intersection affects the focus of the subject in tapping test. There is a conclusion that can be embraced by researchers
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