https://www.americanbar.org/content/dam/aba/uncategorized/GAO/Backgrounder.authcheckdam.pdf
There are three possible ratings that a nominee may receive from the Committee: “Well Qualified,” “Qualified,” and “Not Qualified.” To merit a rating of “Well Qualified,” the nominee must be at the top of the legal profession in his or her legal community; have outstanding legal ability, breadth of experience, and the highest reputation for integrity; and demonstrate the capacity for sound judicial temperament.
The rating of “Qualified” means that the nominee satisfies the Committee’s very high standards with respect to integrity, professional competence and judicial temperament, and that the Committee believes that the nominee is qualified to perform all of the duties and responsibilities required of a federal judge.
When a nominee is found “Not Qualified,” the Committee has determined that the
nominee does not meet the Committee’s standards with respect to one or more of its evaluation criteria – integrity, professional competence or judicial temperament.