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Information Resources Management Association
Advancing the Concepts & Practices of Information Resources Management in Modern Organizations

Tapping on the Move: Fitts’ Law Under Mobile Conditions

Tapping on the Move: Fitts’ Law Under Mobile Conditions
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Author(s): Min Lin (UMBC, USA), Kathleen J. Price (UMBC, USA), Rich Goldman (UMBC, USA), Andrew Sears (UMBC, USA) and Julie A. Jacko (Georgia Institute of Technology, USA)
Copyright: 2005
Pages: 4
Source title: Managing Modern Organizations Through Information Technology
Source Editor(s): Mehdi Khosrow-Pour, D.B.A. (Information Resources Management Association, USA)
DOI: 10.4018/978-1-59140-822-2.ch032
ISBN13: 9781616921293
EISBN13: 9781466665354


Stylus-based interactions are a critical interaction technique for PDA devices due to their compact size. The validity of the classic Fitts’ Law model is unclear under mobile conditions. We conducted a study, investigating the efficacy of a basic stylus operation, tapping, when performed under normal seated conditions as well as when participants walked either slow or fast on a treadmill. Although walking causes instability and difficulties coordinating PDA device with stylus, resulting in challenges with tapping tasks that require precision, Fitts’ Law remained an effective tool explaining over 90% of the variance under both walking conditions. Our results indicate that the selection times for mobile interactions can be estimated by using a smaller IP value in the equation obtained under seated condition. Practical design strategies are derived to guide the development of solutions that can be used effectively under mobile conditions.

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