The results of numerous national and international assessments have raised concerns regarding secondary mathematics education in the United States. According to government reports, there has been a significant increase in the use of technology in U.S. schools in the last decade. However, student achievement in mathematics has not improved during this time. A qualitative case study involved observing and interviewing two high school mathematics teachers and 48 high school students in three Advanced Placement (AP) mathematics classes. The study focused on what students and teachers thought about the integration of technology in mathematics education, on how they actually used technology in class, on whether technology helped students to learn cooperatively, and on whether technology helped teachers improve their instruction. Collective results from questionnaire data, interview data, and class observations helped to build an understanding about how technology was used in the three secondary mathematics classrooms.