To increase the expert knowledge-base on intellectual developmental disorders (IDDs) by investigating the typology trajectories of consensus formation in the classification systems up to the 11th edition of the International Classification of Diseases (ICD-11). This expert review combines an analysis of key recent literature and the revision of the consensus formation and contestation in the expert committees contributing to the classification systems since the 1950s.
Historically two main approaches have contributed to the development of this knowledge-base: a neurodevelopmental–clinical approach and a psychoeducational–social approach. These approaches show a complex interaction throughout the history of IDD and have had a diverse influence on its classification. Although in theory Diagnostic and Statistical Manual (DSM)-5 and ICD adhere to the neurodevelopmental–clinical model, the new definition in the ICD-11 follows a restrictive normality approach to intellectual quotient and to the measurement of adaptive behaviour. On the contrary DSM-5 is closer to the recommendations made by the WHO ‘Working Group on Mental Retardation’ for ICD-11 for an integrative approach.
A cyclical pattern of consensus formation has been identified in IDD. The revision of the three major classification systems in the last decade has increased the terminological and conceptual variability and the overall scientific contestation on IDD.
aCentre for Mental Health Research, Research School of Population Health, ANU College of Health and Medicine, Australian National University, Canberra, Australian Capital Territory, Australia
bCREA, Research and Clinical Centre, San Sebastiano Foundation, Florence, Italy
cIntellectual Disability and Developmental Disorders Research Unit (UNIVIDD) – Fundació Villablanca, IISPV, Universitat Rovira i Virgili, Reus, Catalonia
dCIBERSAM, Centro de Investigación Biomédica en Red, Madrid, Spain
Correspondence to Prof. Luis Salvador-Carulla, MD, PhD, Head, Centre for Mental Health Research, Research School of Population Health, ANU College of Health and Medicine, Australian National University, 63 Eggleston Rd, Acton, Canberra 2601, ACT, Australia. Tel: +61 2 6125 9723/+61 4 6844 0028; e-mail: email@example.com