The purpose of this project is to design a bridge in cooperation with each other. The participant group is divided into smaller teams. All teams must build a railroad bridge with the limited number of materials provided to them. The teams make their plan of action and create the part of the structure they designed. After each team has finished the section they are responsible for, all the works will be combined in coordination with each other. In the end, all sections will be integrated with each other creating a railroad bridge. Any wrong calculation made by any of the teams can result in the entire work falling apart. Rolling a ball across the bridge will test the success of the resulting structure. The activity can be organized in the form of a competition between teams, or all participants can work towards a single goal.