Development of Usability Measures for Computer Mice using One-Directional Fitts’ Law Task

• Main Authors: Yogi Tri Prasetyo, 樂代義
• Other Authors: Chiu-Hsiang Lin
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/hkwrmf

博士 === 國立臺灣科技大學 === 工業管理系 === 107 === Usability is one of the important dimensions of user experience (UX). The purpose of this study was to develop usability measures based on computer mice by utilizing one-directional Fitts’ Law task. Twelve participants were recruited to perform discrete one-directional tapping task using within-subject design with five different mice and three different speeds. Movement time and coordinate position data were used to compute five human performance measures: 1) average completion time 2) coefficient of determination (R2) 3) accuracy 4) Cp 5) throughput. Subjective assessment was evaluated by utilizing semantic differential scale based on ISO 9241-9. Usability was evaluated by applying pairwise comparison to analyze the user preference. Repeated measures analysis of variance (RM-ANOVA) results revealed that the type of mouse and speed had significant effects on average completion time and coefficient of determination (R2). In addition, speed was found had a borderline statistically significant effect on Cp while type of mouse was found had a significant effect on throughput. Stepwise multiple regression showed that average completion time and Cp were two significant human performance measures for predicting usability. Finally, structural equation modeling (SEM) was applied to derive the causal relationship between usability and subjective assessment. The SEM was build based on the proposed usability dimensions supported by ISO 9241-11. These results can help to identify the significant human performance measures and subjective assessment affecting usability. In the end, some recommendations are proposed for developing usability measures that adopt the current study’s research findings. Relevance to industry: This study illustrates the comprehensive usability analysis of computer mice by utilizing a one-directional tapping task. The causal relationship between selected human performance measures and subjective assessment based on ISO 9241-9 should benefit input devices assessment and design.