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Fitts' Law in the Wild: A Field Study of Aimed Movements

Olivier Chapuis 1, 2, Renaud Blanch 3, Michel Beaudouin-Lafon 1, 2

(2007-12)

This paper presents the first field study of aimed movements in graphical user interfaces, designed to get better insight into pointing in the real (electronic) world and assess the validity of Fitts' law in the wild. We unobtrusively collected kinematic data from 24 users over several months, and segmented it into a table of 2 million movements. We show that Fitts' law is indeed robust for modeling pointing performance, provided that an adequate noise reduction process is applied. We introduce the length-distance index (LDI) to take into account the fact that many movements are not straight, and we introduce an extension of Fitts' law that includes an LDI term. We also show evidence of the effect of cognitive tasks in pause and click time, and the sensitivity of differences in performance, e.g., across input devices, to LDI. Altogether, these findings provide a firm ground to better assess the validity of results obtained in the laboratory.

1:	IN-SITU (INRIA Saclay - Ile de France)
	INRIA – CNRS : UMR8623 – Université Paris XI - Paris Sud
2:	Laboratoire de Recherche en Informatique (LRI)
	CNRS : UMR8623 – Université Paris XI - Paris Sud
3:	Laboratoire d'Informatique de Grenoble (LIG)
	CNRS : UMR5217 – INRIA – Université Pierre Mendès-France - Grenoble II – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology

Subject

:

Computer Science/Human-Computer Interaction

Keyword(s): Fitts' law – field study – pointing performance – UI logs

hal-00612026, version 1

http://hal.archives-ouvertes.fr/hal-00612026

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From: Olivier Chapuis <>

Submitted on: Thursday, 28 July 2011 08:28:18

Updated on: Thursday, 28 July 2011 15:58:03