Instead of wasting energy in the vain attempt to hold mentally slow and defective children up to a level of progress which is normal to the average child, it will be wiser to take account of the inequalities of children in original endowment and to differentiate the course of study in such a way that each child will be allowed to progress at the rate which is normal to him, whether that rate be rapid or slow.
I think this would be the best approach to help children that are slower than "normal" children. I stated earlier that the best way to help children learn is to see how they learn such as being hands on, visual, or auditory learning. Everyone doesn't learn stuff at the exact same time, it may take some people longer to understand the concept than other people. Everyone learns differently. This is important to the history of psychology because it helps us understand that children who are slower than other children can develop intelligence at their own speed. I think another reason this is important to the history of psychology is because we now understand the grade of intelligence is different for everyone, but people can build intelligence at their own progressive rate and that we can't force someone who is slower at learning to be at normal speed.