Overview & Quick Facts
The WISC-V (Wechsler Intelligence Scale for Children, 5th Edition) is the most widely used individually administered IQ test for children ages 6 to 16. It produces a Full-Scale IQ (FSIQ) and five index scores measuring distinct cognitive abilities.
Quick Facts
5 Index Scores
Key Takeaway
The WISC-V FSIQ is highly correlated with academic achievement but does not predict it perfectly. A child with FSIQ 130 may underperform academically due to executive function or attention challenges — always interpret WISC-V scores alongside teacher reports and behavior observations.
How to Use This Guide
Use the chapter navigation on the left to explore each section in depth. Start with a specific question type to understand what's tested, then jump to the 4-Week Study Schedule when you're ready to prep.
Verbal Comprehension Index
The VCI measures acquired verbal knowledge and verbal reasoning. Core subtests: Similarities (how are two things alike?) and Vocabulary (define a word).
Child explains how two words are alike: "In what way are a piano and a violin alike?" Tests abstract verbal reasoning and concept formation.
Child defines pictured objects (younger) or words (older). Tests word knowledge and the ability to express concepts verbally.
General knowledge questions: "What is the capital of France?" Tests long-term memory and breadth of acquired knowledge.
Fluid Reasoning Index
The FRI measures the ability to detect underlying conceptual relationships and apply logic to novel problems. It is the index most associated with general intelligence (g).
Choose which picture completes a 2×2 or 3×3 visual matrix. Tests abstract pattern recognition — similar to NNAT/CogAT nonverbal reasoning.
Balance-scale problems — which weight goes on the scale to balance it? Tests quantitative and analogical reasoning.
Working Memory & Processing Speed
WMI and PSI measure cognitive efficiency — how well the brain holds information while working with it, and how quickly it processes simple visual information.
Repeat a string of digits forward, then backward, then in ascending order. Tests auditory working memory — critical for math and reading.
Copy symbols paired with numbers as quickly as possible. Tests graphomotor speed, sustained attention, and visual-motor coordination.
Score Interpretation
WISC-V scores are reported as the Full-Scale IQ (FSIQ) and five Index Scores (VCI, VSI, FRI, WMI, PSI), all with mean 100 and SD 15.
Full-Scale IQ (FSIQ)
Composite of all 10 core subtests. Mean = 100, SD = 15. FSIQ 130+ = 98th percentile (typically required for gifted programs). FSIQ 115–129 = High Average.
Index Scores
Each of the 5 index scores also has mean = 100, SD = 15. Discrepancies between indexes (e.g., high VCI but low PSI) indicate specific cognitive profiles — important for learning disability identification.
130+ FSIQ
Typical gifted program cutoff
Percentile Rank
FSIQ 100 = 50th percentile. FSIQ 115 = 84th. FSIQ 130 = 98th. FSIQ 145 = 99.9th. Both FSIQ and individual index scores are reported with confidence intervals.
Recommended Books
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WISC-V Assessment & Interpretation
Comprehensive guide to administering and interpreting WISC-V scores for psychologists and parents.
Bright Kids WISC Practice Test
Parent-friendly WISC-V practice workbook with timed activities and answer explanations.
Frequently Asked Questions
What is the WISC-V?
The WISC-V (Wechsler Intelligence Scale for Children, 5th Edition) is an individually administered IQ test for children ages 6–16. A licensed psychologist administers it in a 1-on-1 setting over approximately 65–80 minutes.
What does FSIQ mean?
FSIQ stands for Full-Scale IQ — a composite of all five index scores. The FSIQ scale has a mean of 100 and SD of 15. FSIQ 115+ = 84th percentile; FSIQ 130+ = 98th percentile (typical gifted cutoff).
What are the 5 WISC-V index scores?
Verbal Comprehension (VCI), Visual Spatial (VSI), Fluid Reasoning (FRI), Working Memory (WMI), and Processing Speed (PSI). Each index measures a distinct cognitive domain and has a mean of 100 and SD of 15.
Can you prepare for the WISC-V?
The WISC-V tests underlying cognitive abilities. You cannot study the specific questions (they are kept confidential). However, cognitive activities — reading, puzzles, memory games — support healthy cognitive development.
Who administers the WISC-V?
The WISC-V must be administered by a licensed psychologist or school psychologist. It cannot be self-administered or taken online. Many private schools and school districts require WISC-V scores for gifted program admissions.