Definition
Employment practices that appear neutral but disproportionately harm protected groups—essentially discrimination by spreadsheet rather than intent. It's illegal even when accidental, requiring employers to prove business necessity.
Example Usage
The algorithm screening resumes had disparate impact, rejecting female candidates at twice the rate of males due to biased training data.
Origin
Legal doctrine established by Griggs v. Duke Power Co. (1971), formalized in 1978 Uniform Guidelines
Fun Fact
The 'four-fifths rule' is the statistical test: if one group's selection rate is less than 80% of the highest group's rate, disparate impact may exist and trigger investigation.
Source: Civil Rights Act Title VII and EEOC enforcement guidelines
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