This study involved 15 secondary-level teachers who taught fast-paced classes at a university based summer program and similar regularly paced classes in their local schools in order to examine how teachers differentiate or modify instructional methods and content selections for fast-paced classes. Interviews were conducted with the teachers during the summer sessions with a brief survey used as supplemental data. Overall, teachers in this study used a varied set of instructional strategies and in-class activities for their fast-paced classes including lectures, presentations, group activities, demonstrations, frequent tests and quizzes, timed writing, essays, and discussion. The shorter time frame (3 weeks versus 9 months) and teachers' perceptions about students' academic abilities were the two major reasons given for the differentiated instructional strategies and content in the fast-paced classes. In the survey data, less repetition in course content, advanced-level readings and questions, and more independence in learning were found for the fast-paced classes. Yet, the teachers were not likely to move beyond the textbook for enrichment materials or individualize homework or assignments for students in their fast-paced classes. They also expressed concerns regarding depth versus breadth of the material covered in the 3-week courses.