It includes disorders in which one or more
basic psychological processes involved in the comprehension and / or use of language (spoken or written) cause an impairment in a student's ability to listen, think, read, write, spell, and or complete mathematical calculations.
According to the National Center of Learning Disabilities, a learning disability is «a disorder in one or more of
the basic psychological processes involved in understanding or in using language, spoken or written, which disorder may manifest itself in the imperfect ability to listen, think, speak, read, write, spell, or do mathematical calculations».
The IDEA defines a specific learning disability (SLD) as «a disorder in one or more of
the basic psychological processes involved in understanding or in using language, spoken or written, that may manifest itself in the imperfect ability to listen, think, speak, read, write, spell, or to do mathematical calculations.»
«Children with special learning disabilities exhibit a disorder in one or more of
the basic psychological processes involved in understanding or in using spoken or written language.