Abstract

Web accessibility metrics are an invaluable tool for researchers, developers, governmental agencies and end users. Accessibility metrics help to better grasp the accessibility level of websites and are therefore helpful to make decisions based on the scores they produce. Recently, a plethora of metrics have been released; however the validity and reliability of most of these metrics is unknown and those making use of them are taking the risk of using inappropriate metrics. In order to overcome such situation, this note provides a framework that considers validity, reliability, sensitivity, adequacy and complexity as the main qualities that a metric should have.

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