Computing Touch-Point Ambiguity on Mobile Touchscreens for Modeling Target Selection Times
This addresses a methodological problem for HCI researchers in touchscreen studies, but it is incremental as it refines an existing model without introducing new paradigms.
The paper tackled the inconsistency in measuring finger tremor factor (sigma_a) for Finger-Fitts law, a model predicting touch-pointing times on mobile touchscreens, by comparing methods through experiments and reanalyses, finding that parameter optimization is suboptimal for performance prediction.
Finger-Fitts law (FFitts law) is a model to predict touch-pointing times, modified from Fitts' law. It considers the absolute touch-point precision, or a finger tremor factor sigma_a, to decrease the admissible target area and thus increase the task difficulty. Among choices such as running an independent task or performing parameter optimization, there is no consensus on the best methodology to measure sigma_a. This inconsistency could be detrimental to HCI studies such as pointing technique evaluations and user group comparisons. By integrating the results of our 1D and 2D touch-pointing experiments and reanalyses of previous studies' data, we examined the advantages and disadvantages of each approach to compute sigma_a. We found that the parameter optimization method is a suboptimal choice for predicting the performance.