Stopwatch is a six-level series for teenagers, offering entry points from Starter to Beginner Plus and developing skills up to B1 of the CEFR. Each level covers 90-120 hours of instruction, with 20 hours of supplementary materials. Students reinforce visual literacy, critical thinking, cultural awareness, vocabulary, and grammar in realistic contexts. They engage with authentic topics and have practice opportunities in various formats. The series includes hands-on projects and strong visual components, spiraled language development, and a wide range of global cultures.