Revisiting and validating a model of two-thumb text entry
Edward Clarkson, Kent Lyons, James Clawson, Thad E. Starner · 2007
MacKenzie and Soukoreff have previously introduced a Fitts' Law-based performance model of expert two-thumb text entry on mini-QWERTY keyboards [4]. In this work we validate the original model using results from a longitudinal study of mini-QWERTY keyboards, and update the model to account for observed inter-key time data.