Abstract
Many cerebral palsy patients are employed in social welfare companies. They are offered data entry jobs or similar jobs in which they operate computers that run using graphical user interface (GUI) software. Cerebral palsy patients will show their capabilities at work, if they are offered a GUI environment that fits the characteristics of their upper limbs. Positioning operation can be effectively carried out by adjusting the D/C ratio, which is calculated by dividing the movement distance of a pointer by that of an input device. In this study, the speed wave pattern of the pointer on the GUI screen is classified into the movement aspect and the positioning aspect, and the time taken for each movement is calculated. Furthermore, the influence of the D/C ratio on the movement time is discussed in order to determine how the D/C ratio minimizes the movement time. The relation between D/C ratio and the movement time was found to be linear. Further, the relation between the D/C ratio and the positioning time was found to be linear or second-order curvilinear, depending on the target distance and target size.
