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A Study of the Effect of Thumb Sizes on Mobile Phone Texting Satisfaction

Vimala Balakrishnan and Paul, H.P. Yeow

Journal of Usability Studies, Volume 3, Issue 3, May 2008, pp. 118-128

Article Contents


Theoretical Framework

User satisfaction in texting, based on the standard mobile phone keypad design, was identified as the dependent variable whereas keypad design factor(s) was the independent variable (see Figure 2).

Figure 2. Standard ISO 12-key keypad design

Figure 2. Standard ISO 12-key keypad design

The keypad design factors identified are listed below:

These factors were obtained from studies conducted to identify mobile phone design features that are critical to users' satisfaction (Ling et al., 2007; Han et al., 2004; Yun et al., 2003). Other studies that have reported on issues related to some of these features are problems related to tiny keys (Kurniawan et al., 2006; Soriano et al., 2005) and problems related to key size and space between the keys (Balakrishnan et al., 2005; Ornella and Stephanie, 2006). None of these studies took finger or thumb size measurements into consideration.

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