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Related Experiment Video

Updated: Apr 24, 2026

An Assessment Method and Toolkit to Evaluate Keyboard Design on Smartphones
05:42

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Published on: October 5, 2020

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A data-driven design evaluation tool for handheld device soft keyboards.

Matthieu B Trudeau1, Elsie M Sunderland2, Devin L Jindrich3

  • 1University of Calgary, Calgary, Alberta, Canada; Harvard School of Public Health, Boston, Massachusetts, United States of America.

Plos One
|September 12, 2014
PubMed
Summary
This summary is machine-generated.

Optimizing smartphone keyboard design with a new evaluation tool significantly improves thumb interaction. Key factors include keyboard placement and curvature for better user experience.

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Area of Science:

  • Human-Computer Interaction
  • Ergonomics
  • Mobile Device Design

Background:

  • Smartphone keyboards often use layouts similar to PCs, neglecting thumb-specific physical capabilities.
  • Improving thumb interaction on handheld devices can enhance user experience.

Purpose of the Study:

  • To develop and apply a design evaluation tool for QWERTY keyboard geometries on smartphones.
  • To identify optimal keyboard design variables for improved thumb motor performance.

Main Methods:

  • A performance evaluation model using existing thumb motor performance and posture data was employed.
  • 663 keyboard designs were evaluated based on curvature (R), orientation (O), and vertical location (L).
  • A performance index (PITOT) was calculated for each design.

Main Results:

  • The standard QWERTY keyboard performed poorly (PITOT=0.28).
  • Keyboard location (L) significantly impacted performance, with middle locations yielding the best results.
  • Optimal performance (PITOT=1.97) was achieved with a slight upward curve (R=-20 mm) and perpendicular orientation (O=-20°).
  • Worst performance (PITOT=0.09) occurred with specific configurations, including bottom placement and a right-cornered spacebar.

Conclusions:

  • The developed evaluation tool can serve as an ergonomic reference for designing smartphone keyboards.
  • Modifying keyboard location is crucial for enhancing thumb interaction performance.
  • Further research should explore visual access and usability alongside motor performance.