A 50-year personal odyssey through the story of learning disabilities: from primary school to adult LD diagnoses.

The problems with LD diagnosis are the logical consequence of a concept that, after 63 years, has never had a universally accepted definition or empirically validated diagnostic criteria. This essay is a personal odyssey over 50 years that explores the many problems with the LD concept and LD diagnosis that have affected my research, teaching, and clinical practice with children and adults. It is a critical, historical, and analytic journey about the LD story grounded in first-person clinical experience and explicit engagement with diagnostic theory that has implications for first-time adult LD diagnosis. The essay advances several claims about the evolution and current state of the LD concept and LD diagnosis across the lifespan with adult diagnosis as its destination: (1) intra- and inter-individual differences in achievement and cognition are normal and expected, yet were reframed as abnormal through the construct of "unexpected underachievement"; (2) even as the LD field promoted unexpected underachievement, it selectively treated only some individuals' underachievement as "unexpected," creating internal inconsistency; (3) reliance on discrepancy from presumed "potential" (IQ) made diagnosis unnecessarily complex and introduced inequities by excluding lower-achieving individuals; (4) these practices persisted despite substantial empirical evidence challenging their validity; (5) DSM-IV's retention of discrepancy-based approaches contributed to ongoing problems in adult diagnosis and pathologizing of normal variability and average performance; (6) disability standards emphasizing substantial limitation relative to the average person were overridden by continued reliance on discrepancy; and (7) discrepancy, potential, and unexpected underachievement were normalized as enduring conceptual and cultural assumptions. Together, these claims reframe LD as a construct shaped by a story, not science, and call for renewed attention to its theoretical foundations and practical consequences, especially for adult diagnosis.