Tracking Visual observations/best guess gender/race/ethnicity

Summary

How are people managing their opt-out populations?

Content

I would love to hear how other clients are tracking visual observations/best guesses for US employees who have opted out of self-identifying gender and race/ethncity.  Right now, there doesn't appear to be any delivered option other than to overwrite the employees' Not Disclosed value. 

If an employee chooses not to self-identify, we would like to leave that choice in place and have a separate place to track our visual observation/best guess that can then be leveraged in reporting for EEO and internal diversity reporting. We would not want to disclose that value to the employee in case of error/misjudgement.