By Rolf Erichs
The Saab-Scania tale
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Rekik et al. [28] examined user’s perceived difficulty of articulation multi-touch gestures. To deal with users’ variations in multi-touch input, in a previous work [13], we presented the first investigation toward understanding multi-touch gesture 36 Y. Rekik et al. variability. We described a general taxonomy to understand users’ gestures, and to derive implications of users’ variability of gesture articulation. Our taxonomy was the result of a user-centric study giving new insights into the different possible articulations of unconstrained multi-touch gestures.
For example, one participant witnessed that “when the symbol is complicated, such as a five-point star or spiral, I prefer using one finger to be accurate”. Three participants regularly used one finger to enter gestures. Two witnessed they conceptualized strokes simultaneously articulated by multiple fingers as being different, even though the movement was the same. , “I use my finger like a pen”. This finding may have implications for future finger gesture designs, as we already know that finger and pen gestures are similar but also different in many aspects [32].
Rekik et al. 1. The multiple levels of our taxonomy do not model separable attributes to be characterized individually. Instead, they represent the different aspects of a single unified dynamic mechanism employed by users in the production of a multi-touch gesture. At the highest level of our taxonomy, we model the fact that a multi-touch gesture emerges the users’ understanding of the gesture path before touching the surface. From this perspective, an external observer can only try to guess the semantic concept hidden in the user’s gesture, since it might be the case that the gesture itself is not sufficient to fully reveal user’s intention—an observation in accordance with previous studies [4, 29, 30].