This study was conducted to develop insights into how teachers integrate calculators into their course of study. The researcher met with a fifth grade and a sixth grade teacher to plan and implement a 10-day project or mini-unit focused on promoting calculator use. It was agreed that the project would include activity-based lessons to introduce the calculator, a learning center with activities or cooperative group activities, and a science project that integrated mathematics. As resources, the teachers were given commercially prepared calculator materials and were encouraged to make their teaching plans by adapting suitable materials and creating new materials as needed. Meetings were scheduled on a regular basis; ad hoc meetings and phone calls were encouraged to help teachers resolve any daily concerns. An array of methods were used to collect data including participant observation, interviewing, and document collection. Results suggest areas that need to be addressed such as providing ongoing professional development focused on mathematics content, pedagogy, and assessment. Additionally, teachers need planning time to prepare for teaching. (Author/MKR)