A comparative evaluation of calculator watch data entry technologies: Keyboards to chalkboards

Future limitations on the usable complexity of wrist-worn digital devices will depend upon the flexibility and data transmission rate/accuracy of the user-system interface. Three candidate interface types were evaluated as represented by current calculator watch technology. These included hardware keys, software keys and figural recognition. While the figural recognition device theoretically required the least training to operate, other factors degraded operator performance considerably. Specifically, entry rates were slower for this device and error rates higher than for the other two types of devices. It was concluded that the most promising interface for future applications of this type will require technological advances before it becomes competitive with the other interface types.