Intellectual Disability in Context: Definitions, Etiological Factors, Diagnostic Approaches, and Multidimensional Intervention Strategies

Abstract

Background: Intellectual disability (ID) is a lifelong neurodevelopmental disorder with significant implications for individuals, families, and educational systems. Despite its prevalence, conceptual and practical challenges remain in defining, diagnosing, and supporting individuals with ID, particularly within Arab contexts. Aim: This conceptual review aims to synthesize contemporary literature on the definition, etiological factors, diagnostic procedures, and evidence-based interventions for ID, with a specific focus on shifting from a deficit-based model to a supports-based model. Methods: A narrative review of peer-reviewed literature, guidelines from the American Association on Intellectual and Developmental Disabilities (AAIDD), and regional Arabic sources was conducted. Results: The AAIDD (2002) defines ID as significant limitations in both intellectual functioning and adaptive behavior originating before the age of 18. Although etiological factors exceed 200 causes, 75% of cases remain idiopathic. These causes are categorized into prenatal (genetic and non-genetic), perinatal, and postnatal factors. Best practices emphasize the importance of multidimensional assessment over the sole reliance on Intelligence Quotient (IQ). Furthermore, interventions are structured across primary, secondary, and tertiary prevention levels, encompassing medical, psychological, social, and educational domains. Conclusion: Adopting a supports-based, culturally responsive framework is essential for improving outcomes and social inclusion for individuals with ID in Saudi Arabia and the wider Arab world.