There are different kinds of rules. A commonly used test in a disparate impact case is the four-fifths rule which bases potential discrimination of a minority group relative to organization's hiring rate to be less than four-fifths of the hiring rate for the majority group.
There has been evidence of some discrimination if an organization's hiring rate for a minority group is said to be less than four-fifths of the hiring rate for the majority group.
The 4/5ths Rule is known to be a rule of thumb under which looks at the selection rate for any race, or ethnic group and has found it to be less than four-fifths (4/5th) or eighty percent (80%) of the known selection rate for the said group with the biggest selection rate.
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