Hammill (1988) said that “Learning disabilities is a generic term that refers to a heterogeneous group of disorders manifested by significant difficulties in the acquisition and use of listening, speaking, reading, writing, reasoning or mathematical abilities.”
National Center for Learning Disability (1980) said that “Learning disability is a neurological disorder that affects the brain’s ability to receive process, store & respond to information.”
NICHCY (2011) said that “Learning disability is a general term that describes specific kinds of learning problems. A learning disability can cause a person to have trouble learning and using certain skills. The skills most often affected are: reading, writing, listening, speaking, reasoning, and doing math.