🛠️ Prototype Retest Evidence Board

Teams carry out their targeted revision on the scaled circular prototype, retest with the same rulers, string, protractors, grid paper, and measurement protocol, and record updated data with units. They add before-and-after photos, revised calculations, and a brief engineering explanation to a draft performance evidence board or QR-linked slide for the upcoming showcase. To close, teams give feedback to 2 peers, receive feedback, revise the board once more, and complete the exit circle by naming one circle concept they can now apply and one remaining question.