How far are the Web sites from accessibility? Such a question implies a measure and, before, metrics or a set of metrics to quantitatively describe distances or closeness to one or more aspects of inclusion. Quantitative evaluations can effectively guide the improvement of sites quality and of skills which are necessary along the content authoring process. This paper details the hypothesized metrics and measures on the Vamolà project, which has been issued to integrate a monitor and a validator of the Web accessibility, according to the Italian Law. On Vamolà, the validation tool output can be effectively used in defining metrics inside the monitor application.

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