Accessibility Score calculation

Based on whether an accessibility rule is applicable, passed, or failed, a multiplier is assigned as follows:

Based on the level of severity of each accessibility rule, a score is assigned as follows:

The total actual score and the total possible score are then calculated using the following formulae:

If there are r rules supported by our rule engine, then for every rule i from 1 to r,

For passed rules (1 to p), Impact of passed rules on score = P = Σ(Severity_i * Applicable_i * Multiplier_i)

For failed rules (1 to f), Impact of failed rules on score = F = Σ(Severity_i * Applicable_i * Multiplieri_i)

Here, severity mapping is as follows:

Minor: 1, Moderate: 3, Serious: 7, Critical: 10

Note that with the multiplier as 2 for failed rules, the failed rules are penalized twice. This causes the effective value to double as follows:

Minor: 2, Moderate: 6, Serious: 14, Critical: 20

Score (URL & report/scan level) =

Calculate the individual score for each URL that is a part of the report/scan

Accessibility score of a URL or page = P/(P+F)

The page score is calculated using the following formula:

For every page x from 1 to n in the scan,

Accessibility Score (report/scan) = [Σ(Px) / (Σ(Px)+Σ(Fx))] * 100