Every assessment, every interview, every shortlist is monitored for adverse impact against protected groups, per role, per stage, per audit cycle. The 4/5ths rule is the floor; we report against tighter thresholds and publish the breach rate annually.
At 90 days and again at 12 months, the hiring manager confirms how the hire is performing. That signal feeds back into the model. Recommendations that turned out to be right reinforce the weight; recommendations that turned out to be wrong correct it. Validity is not declared at launch; it is measured continuously.