1. Getting Started (2:53m)
Teacher: Christine Fairless
The teacher motivates students by probing for previous knowledge and showing a video clip of Antarctica.

2. Teacher/Student Discussion (4:21m)
Students have previously designed research stations, and now reflect on the cost of heating their building.

3. Student Activity (4:26m)
Students interpret the graph of the building cost vs. the heating cost projected over a ten-year period.

4. Student Dialogue (2:45m)
Students dialogue to compare their work and discover differences. The teacher leads students to describe the relationship.

5. Student Work (6:31m)
Using computers, students enter data and choose the highest R-value of insulation that best keeps cost down.

6. Students Present (3:09m)
Groups present their graphs and demonstrate their reasoning for recommending a certain R-value insulation.