An investigation into round touchscreen wristwatch interaction | PDF
What if your smart watch looked like a normal analog watch? How would you interact with it?
Abstract: The wristwatch is a device that is quick to access, but is currently under-utilized as a platform for interaction. We investigate interac- tion on a circular touchscreen wristwatch, empirically determining the error rate for variously-sized buttons placed around the rim. We consider three types of inter-target movements, and derive a math- ematical model for error rate given a movement type and angular and radial button widths.