The effects of hand strength on pointing performance

We have investigated how physical capabilities of users with a wide range of abilities are reflected in their interactions with digital devices. In particular, we have investigated how hand strength affects pointing performance of people with and without motor-impairment for different input devices. Our study indicates that people having higher hand strength also have greater control in hand movement and can perform pointing faster. This result also holds true independently of motor-skills. However we have also found that an appropriate choice of an assistive technology (like a single switch scanning system) can make the interaction speed independent of the physical strength of users.