An important tool for proving a prima facie case of adverse impact is the four-fifths rule.

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The four-fifths rule is an important tool for proving a prima facie case of adverse impact. It states that if the selection rate for a protected group (e.g. a certain race or gender) is less than four-fifths or 80% of the selection rate for the group with the highest selection rate, there is evidence of adverse impact and further investigation may be warranted.

An Important Tool for Proving a Prima Facie Case of Adverse