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Web usability evaluation with screen reader users: implementation of the partial concurrent thinking aloud technique.

Stefano Federici¹, Federici Stefano, Simone Borsci

¹Department of Human and Education Sciences, University of Perugia, Perugia, Italy.

Cognitive Processing

|November 17, 2009

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A new method, partial concurrent thinking aloud (PCTA), improves web usability evaluations for blind users. This technique overcomes limitations, enabling comparable problem-identification rates between blind and sighted users.

Area of Science:

Human-Computer Interaction
Accessibility Research
Usability Engineering

Background:

Traditional verbal protocol techniques for web usability evaluation pose challenges for visually impaired users relying on screen readers.
The concurrent task of thinking aloud while listening to a screen reader creates structural interference, impacting evaluation accuracy.
Existing concurrent and retrospective protocols have limitations when applied to screen reader users.

Purpose of the Study:

To develop an improved verbal protocol technique for visually impaired users to enhance web usability evaluations.
To overcome the limitations of concurrent and retrospective protocols for screen reader users.
To reduce the efficiency gap in usability evaluation between blind and sighted users.

Main Methods:

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A novel technique, partial concurrent thinking aloud (PCTA), was developed, combining modified concurrent verbalization and retrospective analysis.
The study involved two groups: 6 blind users and 6 sighted users, evaluating website usability.
An asymptotic test was used to estimate the number of users required for reliable problem identification.

Main Results:

Both blind and sighted user groups demonstrated equivalent abilities in identifying usability problems, achieving over 80% accuracy.
The partial concurrent thinking aloud (PCTA) technique effectively addressed the structural interference issue faced by screen reader users.
The study found that PCTA maintains the properties of classic verbal protocols while mitigating their limitations.

Conclusions:

Partial concurrent thinking aloud (PCTA) is a viable and effective method for conducting web usability evaluations with visually impaired users.
PCTA enhances the efficiency and comparability of usability testing across diverse user groups, including those with visual impairments.
This improved technique promotes more inclusive and accurate accessibility research in human-computer interaction.