1. Intelligence Testing

2. When to Use IQ Testing Placement decisions
Retardation
Giftedness
Determination of cognitive strengths and weaknesses (Tx planning)
Establishing a baseline
Prediction of job performance
Part of neuropsych assessment

3. Views of Intelligence “g” models and factor analysis
Fluid vs. crystallized
Multiple intelligences
- Sternberg
- Gardner

4. Assumptions of the IQ Model
“g” factor exists
IQ is not innate or fixed
Not an achievement test
Tests are reasonably culture-fair
Scores predict outcomes, but not perfectly
Scores must be interpreted by a skilled professional in a context

5. Wechsler on Intelligence
“Intelligence... Is the aggregate or global capacity of the individual to act purposefully, to think rationally, and to deal effectively with his environment... It is composed of elements or abilities which, though not entirely independent, are qualitatively differentiable.”

6. Limitations of Wechsler Scales
Assumes a “g” model
Applicability to minorities
Complicated scoring subject to errors
Subjectivity in scoring some responses
Environmental influences affect scores (e.g., effort, anxiety)

7. WAIS-III Subtests Performance Verbal Picture Compltn Vocabulary
Digit Symbol Similarities
Block Design Arithmetic
Matrix Reasoning Digit Span
Pic Arrangement Information
Symbol Search* Comprehension
Object Assembly* Letter-Number Seq

8. WISC-III Subtests Performance Verbal Picture Compltn Information
Coding Similarities
Pic Arrangement Arithmetic
Block Design Vocabulary
Object Assembly Comprehension
Symbol Search* Digit Span*
Mazes*

9. Levels of Intelligence
IQ Score Classification % incl
Very Superior 2.1
Superior 8.3
High Average 16.1
Average 50
Low Average 14.8
Borderline 6.5
69 - Extremely Low 1.9
(WAIS-III)
Intellectually
Deficient
(WISC-III)

10. Steps in Interpreting an IQ Test
Know your referral question
Gather appropriate background data
Evaluate global scores: Full Scale, Verbal & Performance, Index Scales
Evaluate subtests and scatter
Intra and inter-individual differences
Interpret significant differences
Integrate behavioral observations