Before the activity starts: 

• On this final day, we want students to make one improvement to their design/ prototype based on feedback they received, and then share their work.

Throughout the activity: 

• Students should not try to start over or make radical changes to their prototype, but make improvements that are possible within the time frame. 
• The iteration that they make should bring their site model intervention more closely aligned with their concept thesis. 

At the end: 

• The final share-out should be celebratory and highlight the students' quick and engaged work!