I think this is interesting because they had thought that under the right conditions that children would be equally, or almost equally, capable of making satisfactory school progress, but they made a discovery that not all children are equal or almost equal. There are different grades of intelligence depending on the person because everyone is different. This is important to the history of psychology because there has now been a discovery of different grades of intelligence. They used to think that children had an equal intelligence or almost equal but there are many different grades of intelligence grading from idiocy to average to genius. We still utilize the grades of intelligence today, but the grades are categorized differently such as idiocy being extremely low on the intelligence scale and genius being very superior. We have changed the name of the grades of intelligence.