Dysgraphia is a :

Concept: Developmental and disability conditions are classified by the domain of functioning they impair: production of speech sounds, control of the large muscles used for movement, the neurological processing that underlies one specific academic skill, or the regulation of attention and impulse. The prefix "dys-" means impaired and the Greek root "graphia" means writing, so a term built on that root names an impairment located in the writing domain.

Application: Dysgraphia is a neurological (neurodevelopmental) specific learning disability of written expression. The difficulty is not explained by low intelligence, by uncorrected vision or hearing problems, or by lack of teaching; the disturbance lies in the brain’s integration of language with the fine-motor act of handwriting. The visible result is malformed letters and shapes, irregular size, spacing and alignment, laboured and slow writing, an awkward pencil grip, and spelling that breaks down on paper even when the same word can be spelled aloud.

Contrast: each description names a different domain.

Cross-check: Dysgraphia does not itself impair speech production, mobility or attention regulation — those belong to the other three domains, although a child may have more than one condition at the same time, and co-occurrence with ADHD or a speech-language disorder is common. What identifies dysgraphia is that the breakdown is located in the written-expression domain. That is why dysgraphia is described as a neurological disorder characterized by trouble in forming letters and shapes.