Schedlbauer, M: Nomadic Data Entry

Computers are increasingly being used in settings away from the desktop. Examples of such systems include in-vehicle navigation systems, personal digital assistants, and mobile telephones. Working with such devices is more complex because the interactions are typically carried out in conjunction with other tasks. In addition, the interaction frequently happens in a non-stationary environment, i.e., one where the user and the computing device are moving. This book details the investigation whether completion time in dual-task situations increases, and whether the activation of on-screen controls through manual input devices, such as a trackball, joystick, or touch screen, is unchanged when the targets are not stationary, and whether the present models for predicting task completion time still apply in mobile settings. The book presents at a collection of predictive models for estimating the time it takes to enter data in a nomadic context. The models provide ers of mobile devices estimates for mean task completion time of data input tasks.