The term learning disabilities was first coined by Samuel Kirk in 1963 at an association of parents in New York City. The U.S. Department of Education and Public Law 476-101 define learning disability as: A disorder in one or more basic psychological processes that impairs the comprehension or use of spoken or written language and may result in impaired ability to listen, thought Appear, speak, read, write, spell words or do mathematical calculations. The term includes conditions such as perceptual disabilities, brain damage, partial brain dysfunction, dyslexia, and developmental dysfunction, but includes children who initially develop visual, auditory, motor, mental retardation, mental retardation, mental retardation, mental retardation, mental retardation, and mental retardation. Have been learned, not included. A child's or adolescent's learning disabilities are characterized by a lack of academic achievement in reading, writing, or mathematics compared to the child's overall intelligence ability. The revised text includes learning disabilities in four diagnostic categories: reading disorder, math disorder, written expression disorder, and indeterminate learning disorder.