다양한 스마트폰 터치 탭 조작의 만족도에 영향을 미치는 디자인 요소 및 적합한 응답시간

Background Tap operations by finger touch are the most basic and importantfunctions in smartphones. However, existing guidelines on their response timeshave not yet reflected recent users’ expectations of high speed, and various typesof touch taps and their response times.
Methods In order to investigate proper response times and design factorsinfluencing user satisfaction with response speeds, this study established severalmeasures for tap operations and their responses, and measured the performancesthrough high-speed video analysis on four smartphones. Then, an experimentwas performed to evaluate user satisfaction with system responses, and therelationships between the measured performances and user satisfaction wereanalyzed.
Results The speed satisfaction of visual feedback did not show a bigdifference if the response time was less than 0.2 seconds. For high satisfaction,offline apps should initially respond within about 0.2-0.4 seconds and becompleted within approximately 1.0 seconds. In the case of online apps, showingprogressive changes while the apps are loading was more important. Similarly,smooth movement patterns influenced speed satisfaction in deleting a memo orrotating a picture. For a double tap, the proper time interval between two taps andthe expansion starting time was approximately 0.1 seconds. Also, the satisfactionwas high when a long tap was initiated after 0.7 seconds and text input wasresponded to within 0.1 seconds.
Conclusion This study presented fundamental performance guidelines onsatisfactory response times for various touch tap operations and their responses.
In addition, important design factors affecting user satisfaction of speed werederived.