• Framing the field as a contested project, these works probe the purpose, scope, and legitimacy of special education, weighing inclusion versus segregation and urging reinterpretation of categories and goals [1], [4], [5], [15], [6].

• Systematic evaluation of classroom interventions and program effectiveness, from special class training impacts to conduct problem remediation and classroom behavior management, highlighting early empirical approaches to tailoring interventions [11], [16], [13], [20], [19].

• Social integration and peer relations are foregrounded through studies of integrating handicapped and nonhandicapped preschoolers, social play, and inclusive education, informing practices and attitudes toward inclusion [18], [9], [14], [19], [7].

• Diagnostic rationales, prevalence estimates, and conceptual foundations for learning disabilities are traced from early prevalence studies to psychoeducational underpinnings, signaling field maturation [8], [12], [2], [17], [7].

• Early childhood and preschool contexts emerge as testing grounds for inclusive practices and teacher preparation, with analyses of disadvantaged learners, program critiques, and evolving policy directions [14], [5], [4], [15].