This document discusses the history of learning disabilities (LD) and its development over four periods:
1) The European foundation period from 1800-1920 saw the introduction of terms like "word blindness" and early studies identifying reading disabilities.
2) The US foundation period from 1920-1965 included important advances in identification methods, teaching approaches, and theories of LD due to scholars like Samuel Orton.
3) The emergent period from 1965-1980 became more politicized as LD gained recognition and funding from government and advocacy groups in countries like the UK and US.
4) The revision and progression period from 1980 onward has entailed revising identification approaches in response to concerns over misdiagnosis and exploring new