Motivational interviewing is an evidenced-based counseling approach that health care providers can use to help patients adhere to treatment recommendations. It emphasizes using a directive, patient-centered style of interaction to promote behavioral change by helping patients explore and resolve ambivalence. This article will help nurses learn how to use motivational interviewing to encourage patients to adhere to treatment recommendations. The basic theoretical underpinnings, principles, and methods of motivational interviewing are discussed, with an emphasis on acting in accordance with the "spirit" of the approach.