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Personal and Ubiquitous Computing

, Volume 17, Issue 1, pp 69–79 | Cite as

How natural is a natural interface? An evaluation procedure based on action breakdowns

  • Luciano Gamberini
  • Anna SpagnolliEmail author
  • Lisa Prontu
  • Sarah Furlan
  • Francesco Martino
  • Beatriz Rey Solaz
  • Mariano Alcañiz
  • Josè Antonio Lozano
Original Article

Abstract

This paper describes an issue-based method to evaluate the naturalness of an interface. The method consists of the execution of a series of tasks on that interface, which is subsequently systematically analyzed to identify breakdowns in the users’ actions. The systematic analysis of breakdowns is allowed by the support of video-coding software (The Observer by Noldus). This method is described on its theoretical bases and then applied to the evaluation of a natural interface, a walk-in-place locomotion system for virtual spaces called Superfeet. The procedure is comparative, since Superfeet is compared to two locomotion devices, Superfeet enhanced with headtracker and a more traditional Joypad. The test involves 36 participants (mean age = 23.68, SD = 3.14). The outcomes of the breakdown analysis are illustrated at a progressively finer level of granularity from the amount and length of breakdowns, to the circumstances of the breakdowns, to the type of actions involved in the breakdowns. The potential of this procedure for usability studies is finally synthesized.

Keywords

Usability Naturalness Action breakdown Systematic video analysis 

Notes

Acknowledgments

The authors would like to thank Daniel Kerrigan for his help in the data collection and quantitative analysis; they also would like to thank Merche Calvet for her work in the development of the SuperFeet system. Beatriz Rey Solaz, Mariano Alcañiz, and Josè Antonio Lozano developed Superfeet and the virtual environments for the test, while Luciano Gamberini, Anna Spagnolli, Lisa Prontu, Sarah Furlan, and Francesco Martino carried out the breakdown analysis.

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Copyright information

© Springer-Verlag London Limited 2011

Authors and Affiliations

  • Luciano Gamberini
    • 1
  • Anna Spagnolli
    • 1
    Email author
  • Lisa Prontu
    • 1
  • Sarah Furlan
    • 1
  • Francesco Martino
    • 1
  • Beatriz Rey Solaz
    • 2
  • Mariano Alcañiz
    • 2
  • Josè Antonio Lozano
    • 2
  1. 1.Dipartimento di Psicologia GeneraleUniversità di PadovaPadovaItaly
  2. 2.Instituto de Investigación e Innovación en BioingenieríaUniversidad Politécnica de ValenciaValenciaSpain

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