During testing data collection, a 4x4 grid of numbered
crosshairs was provided as touch targets. Users were asked
to touch, with a single finger, each crosshair in order. Two
rounds were completed, yielding 32 touch events per participant.
In addition, participants performed, in locations of
their choosing, ten one-handed pinches, ten bi-modal twofinger
touches, and ten palm touches. In total, this process
provided 62 touch events, using four different gestures,
distributed over the entire surface of the screen.