Title VII of the Civil Rights Act of 1964 makes it “an unlawful employment practice for an employer . . . to discriminate against any individual with respect to his compensation, terms, conditions, or privileges of employment, because of such individual’s race, color, religion, sex, or national origin.” 42 U. S. C. §2000e–2(a)(1). This provision obviously prohibits discrimination. Under Title VII, an employer’s liability for workplace harassment may depend on the status of the harasser. If the harassing employee is the victim’s co-worker, the employer is liable only if it was negligent in controlling working conditions. In cases in which the harasser is a “supervisor,” however, different rules apply. If the supervisor’s harassment culminates in a tangible employment action (i.e., “a significant change in employment status, such as hiring, firing, failing to promote, reassignment with significantly different responsibilities, or a decision causing a significant change in benefits,” Burlington Industries, Inc. v. Ellerth, 524 U. S. 742, 761), the employer is strictly liable. But if no tangible employment action is taken, the employer may escape liability by establishing, as an affirmative defense, that (1) the employer exercised reasonable care to prevent and correct any harassing behavior and (2) that the plaintiff unreasonably failed to take advantage of the preventive or corrective opportunities that the employer provided. Faragher v. Boca Raton, 524 U. S. 775, 807; Ellerth, supra, at 765. Held: An employee is a “supervisor” for purposes of vicarious liability under Title VII only if he or she is empowered by the employer to take tangible employment actions against the victim. The interpretation of the concept of a supervisor adopted today is one that can be readily applied. An alleged harasser’s supervisor status will often be capable of being discerned before (or soon after) litigation commences and is likely to be resolved as a matter of law before trial. By contrast, the vagueness of the EEOC’s standard would impede the resolution of the issue before trial, possibly requiring the jury to be instructed on two very different paths of analysis, depending on whether it finds the alleged harasser to be a supervisor or merely a co-worker. This approach will not leave employees unprotected against harassment by co-workers who possess some authority to assign daily tasks. In such cases, a victim can prevail simply by showing that the employer was negligent in permitting the harassment to occur, and the jury should be instructed that the nature and degree of authority wielded by the harasser is an important factor in determining negligence. 646 F. 3d 461, affirmed. (U.S.S.Ct., 24.06.2013, Vance v. Ball State Univ., J. Alito).