17 Days is a theory-based interactive DVD designed to educate young women about contraception and sexually transmitted diseases (STDs). The DVD presents different scenarios involving decisions that young women face in relationships, identifies choice points, suggests risk-reduction strategies, and allows viewers to practice what they would do in a similar situation. The video is interactive, allowing viewers to select or skip sections. Viewers are given the opportunity to mentally practice how they would respond in hypothetical situations, through the frequent use of “cognitive rehearsal.”