At the risk of causing a controversy, I am going to tell you what I think dysgraphia is! The reason I say this is controversial is that the definition of dysgraphia has changed through the years, and I disagree with the direction it took.
Dysgraphia is a neurological problem. People who are dysgraphic do not have fine motor control of their fingers; therefore they cannot write legibly. They cannot control the pencil and make it do what they need it to do.
If a child writes poorly after they have been taught how to write, they are often incorrectly labeled dysgraphic. But, many children are not ready to learn to write at the point they are taught how. I believe this especially to be true of boys who developmentally are not ready to sit down and concentrate on forming their letters correctly. I have personally witnessed many of these children learn how to write quite legibly in middle and upper school. This is because they are developmentally ready to learn when they are older. Dysgraphic people cannot learn how to write legibly because they do not have the ability to control the muscles involved in their hand.
If you have an older child who does not write legibly, it is possible that they can still learn if given proper instruction. I’ll write about that "proper instruction" very soon!