The Emergent Bilingual Child Facing an Intellectual Disability Classification
Ana is 10 years, 4 months, a Spanish-dominant emergent bilingual enrolled in a dual-language program since kindergarten. She was referred for reading concerns. The evaluator administered the WISC-V in English: FSIQ 78, Verbal Comprehension 68, Perceptual Reasoning 92, Working Memory 81, Processing Speed 85. English CTOPP-2 scores were low; no Spanish reading measure was given. Her teacher reports she is quiet, rarely volunteers, and received eight weeks of English-only intervention with minimal progress. A parent interview conducted with an interpreter indicates typical Spanish language milestones and vivid storytelling in Spanish at home. The school now proposes an intellectual disability classification based on the FSIQ.
1. Critique the proposed use of the FSIQ and interpret the index pattern.
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An FSIQ of 78 cannot carry the classification here because it is a composite that averages markedly discrepant indexes, and the lowest index is the one most contaminated by language experience. Verbal Comprehension at 68 is consistent with a child tested in her weaker language after years of dual-language schooling; Perceptual Reasoning at 92 is solidly average and is a better estimate of reasoning less dependent on English. Averaging these into a single number obscures the pattern and understates her ability. Intellectual disability requires deficits in intellectual functioning and adaptive behavior arising in the developmental period, not a low composite score alone. The current data also lack adaptive assessment, Spanish-language measures, and a defensible test-selection rationale. Standards for fair assessment require instruments validated for the examinee's language and culture or documented justification for alternatives. My conclusion would be that the FSIQ is not interpretable as a unitary ability estimate, that the pattern argues against an ID classification, and that the evaluation is incomplete.
2. What assessment and decision-making steps should follow, and how do you distinguish disability from language difference?
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The next step is a comprehensive, dual-language evaluation. I would assess Spanish and English language proficiency separately to establish dominance and proficiency for testing and instruction, administer reading measures in both languages with bilingual norms where available, and gather adaptive behavior data from parent and teacher using a normed instrument with appropriate Spanish norms and interpreter safeguards. I would examine the eight-week intervention data closely: minimal progress in a weak language with English-only instruction is not strong evidence of disability, and I would want data on intervention fidelity, dosage, and whether instruction matched her language needs. The key discriminator is a pattern of unexpected underachievement relative to opportunity and ability, corroborated across languages, not low scores in one language. I would reconvene the team, present the discrepancy between average nonverbal reasoning and depressed English verbal scores, recommend continued dual-language support, and resist an ID classification unless adaptive deficits are documented independently.