Teaching variables(controlled, independent, and dependent) is a long process, but if you use The Bubble Experiment, a scaffold, and teach students about repeatability in science, you will have success. The Bubble Experiment is a standard lab that is simple to set up, requires few materials, is fun, and produces great data. I t remains a free product in my store without the resources and insights this product provides.I have added phases that focus on developing the ideas of the different variab