Data entry for mobile devices: an empirical comparison of novice performance with Jot and Graffiti
✍ Scribed by Andrew Sears; Renee Arora
- Book ID
- 104359280
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 202 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0953-5438
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✦ Synopsis
In this article, we report on an empirical comparison of two common gesture recognition techniques. Thirty-one novices completed six realistic tasks using either Jot or Graf®ti. An analysis of error-corrected data entry rates indicates that participants using Jot completed the tasks signi®cantly faster than those using Graf®ti. An analysis of uncorrected errors yielded no signi®cant differences while several questions assessing subjective satisfaction yielded signi®cantly more positive results for Jot. A new event called Period of Dif®culty (PoD) is proposed to help identify situations were novices experience signi®cant dif®culty. Users experience more PoD when entering basic alphanumeric characters using Graf®ti than they do using Jot. In contrast, Jot users experience more PoD when entering symbols than Graf®ti users. Further, a detailed analysis of the PoD provides insights regarding the de®nition and use of the inherent accuracy metric while highlighting opportunities to improve the underlying technologies. We conclude by providing speci®c recommendations for improving the usability of Jot and Graf®ti for novice users and outlining several additional directions for future research.