Performance of a rule-based handwriting recognition system is considered. Performance limits of such systems are defined by the robustness of the character templates and the ability of the system to segment characters. Published performance figures, however, are typically based on pre-segmented characters. Six experiments are reported (using a total of 128 subjects) that tested a state-of-the-art recognition system under more realistic conditions. Variables investigated include display format (grid, lined, and blank), surface texture, feedback (location and time delay), amount of training, practice, and effects of use over an extended period. Results indicated that novice users writing on a lined display (the most preferred format) averaged 57% recognition performance. By giving subjects continuous feedback of results, training, and after about 10 minutes of use, the system averaged 90.6% character recognition. Following three hours of interrupted use and with performance incentives, subjects achieved an average 96.8% accuracy with the system. Future work should focus on improving the ability of the recognition algorithm to segment characters and on developing non-obtrusive interaction techniques to train users, to provide feedback and to correct mis-recognized characters.
Designers of interactive systems often work in environments that am continuously changing. External, uncontrollable change is rapidly becoming a daily impedim~t in many designers' lives. In this age of rapid technologml progression and heightened competition, systems designers must be able to prepare for, cope with, and even pdbrm better because of inevitable change. 13ecauM the nature of user interbce design is to make complicated technology usable, user intedltce designers tve especially afkcted by design changes.This paper is a chronicle of the adventures of time user interl%ce designers while working on the design of an interactive system within a changing domain.We describe the kinds d changes that atlkc$ desi~the impact of change on the design process, how a designer can prepare fw change, and finally, how to respond to change.By sharing our experiences on a project fkught with change, we hope to help other &signers learn to work well within a changing design environment.
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