It is very important that children learn to reason and develop a critical mind. They must be able to think critically in order to deal with situations in the real world when we are no longer by their side and they must be equipped with the tools they need to continue developing.
With pupils with attention deficit hyperactivity disorder (ADHD), we need to consider two dimensions. The first is what you have to do to help the child learn. and the second is how to understand the situation you're dealing with in the classroom. Why do I say this? Children with ADHD often have substantial intellectual abilities. There is no correlation between ADHD and intellectual ability.
Children with ADHD can usually function very well when they're interested in something. They are often very alert and clever, and yet, there are certain expectations as regards their intellectual ability. But I don't consider the kid to have a neurological dysfunction in things as important as their organizational capacity. Or their ability to concentrate for extended periods of time. Or their ability to control their impulses and not interrupt much more frequently than other children do. Or the fact that they behave in a way a ten-year old child should have grown out of.
It is very important that teachers are informed about what is happening neurologically with these children and understand that they way they behave is always going to be what you would expect from a child three or four years younger with respect to autonomy, planning, concentration, impulse control, ability to moderate their emotions, etc., and not associate their conduct with intellectual ability.