Builders know what to do because they get a special paper called a plan or a blueprint from engineers. Think of it like a treasure map that shows them how to make a building!
First, the engineers draw a picture that shows the shape of the building, just like when you draw a house. Then, they show where the doors and windows go so that people can come inside and look outside!
Finally, the plan tells the builders what materials to use, like wood, bricks, or metal. It’s like having a recipe when you want to bake cookies! With this plan, the builders can build the building just right.