Transportation engineers guarantee our safety as pedestrians and motorists. They analyze data to maximize the efficiency of the transportation that moves us and the goods we depend on to live.
So as the fourth graders followed their plans and tested their ideas, they quickly learned to evaluate what they had done and make changes. Maybe they needed to change the width of their Maglev, the type of magnet they used, or the number of magnets on their train. Even more important was making sure the "people" didn't fall off the train.