Transtorno de aprendizagem com impairment in written expression is characterised by significant and persistent difficulties in learning academic skills related to writing, such as spelling accuracy, grammar and punctuation accuracy, and organisation and coherence of ideas in writing. The individual’s performance in written expression is markedly below what would be expected for chronological age and level of intellectual functioning and results in significant impairment in the individual’s academic or occupational functioning. Transtorno de aprendizagem com impairment in written expression is not due to a transtorno of intellectual development, sensory impairment (vision or hearing), a neurological or motor transtorno, lack of availability of education, lack of proficiency in the language of academic instruction, or psychosocial adversity.