The "Four-Fifths" rule, also known as the 80% rule, is a guideline used in employment practices to assess potential discrimination. It states that the selection rate for any racial, ethnic, or gender group should be at least 80% of the selection rate for the group with the highest rate. This rule helps organizations ensure fair hiring practices and identify any significant disparities in their recruitment processes. For example, if 100 applicants from a group are hired, and 50 of them are from a minority group, the selection rate for that group is 50%. If the highest selection rate for another group is 70%, the four-fifths rule suggests that the minority group's hiring rate should be at least 56% (which is 80% of 70%). This helps promote equal opportunity in the workplace and supports compliance with laws like the Civil Rights Act.