*5.4.1 Procedure*

All 20 children wait to be called to the heads of the train. Each child is whispered to choose between a chocolate and a cake. Once the choice is made, the child goes behind the head s/he has chosen. This continues until all 20 children have selected the head they belong to. Once the choices are made, the carriages are made of the children that have chosen each head. The time now to create a bridge by drawing a line on the floor comes. Each head together with their carriages try to pull each other; the ones that crossover the line belong to the group on the other side. There is a strategy implemented during the pulling time. Those children who are stronger are the ones who must always be directly pulling the head, and the tiny ones are always at the back until the game is over.
