"When he lectured in the United States, Swiss psychologist Jean Piaget would invariably

[BigmanPigman]

2. Teachers know this.

There are levels of development and that is a fact. You can't push a 6 year old to read at a 4th grade level but that is what states are requiring and teachers have no say at the table. When I taught 1st grade teachers in my district were forced to determine each student's reading level as soon as school started when they had been assessed only 3 months earlier before summer vacation. It is a colossal waste of time. Teachers are forced to "teach to the test" so kids can score higher in particular areas without allowing them to develop and comprehend the content. Teachers are beyond frustrated by this practice.