Overview & Quick Facts
The Stanford-Binet Intelligence Scales, 5th Edition (SB5) is one of the two most widely used individually administered IQ tests worldwide. It covers ages 2 through 85+ and assesses five cognitive factors: Fluid Reasoning, Knowledge, Quantitative Reasoning, Visual-Spatial Processing, and Working Memory.
Quick Facts
5 Factor Scores
Key Takeaway
The SB5 Extended Norms are specifically used for profoundly gifted identification — it extends scoring beyond the standard IQ scale to identify children with IQs of 160+ who would otherwise hit the ceiling of standard IQ tests. The WISC-V cannot reliably measure above IQ 160.
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.
Fluid Reasoning & Knowledge
Fluid Reasoning (FR) measures novel problem-solving; Knowledge (KN) measures crystallized intelligence — accumulated learning and verbal knowledge.
Object Series, Matrices — detect patterns in novel visual stimuli. Tests pure reasoning ability independent of prior learning.
Early Reasoning (young children) and Verbal Absurdities / Verbal Analogies (older) — tests logical verbal reasoning.
Vocabulary and Picture Absurdities — tests the breadth and depth of knowledge accumulated through experience and education.
Quantitative, Visual-Spatial & Working Memory
Three additional factor scores complete the SB5 cognitive profile.
Nonverbal and Verbal Quantitative subtests — mathematical reasoning using number concepts and quantitative relationships.
Form Board and Form Patterns — constructing designs and recognizing spatial relationships. Measures visual-spatial intelligence.
Block Span (nonverbal) and Memory for Sentences/Last Word (verbal) — measures the capacity to hold and manipulate information in mind.
Score Interpretation
SB5 reports FSIQ, Nonverbal IQ, Verbal IQ, and five Factor IQ scores, all with mean 100 and SD 15. Extended Norms extend scoring to IQ 160+ for profoundly gifted assessment.
Full-Scale IQ (FSIQ)
Mean 100, SD 15. Combines all 10 core subtests (5 verbal + 5 nonverbal). SB5 FSIQ correlates highly with WISC-V FSIQ — most gifted programs accept either.
Extended Norms
SB5 Extended Norms extend scoring to the profoundly gifted range (IQ 160+). Standard IQ tests cannot reliably distinguish above IQ 150–155. Extended norms require additional subtests and specialized interpretation.
160+ IQ
Extended norms ceiling
Nonverbal & Verbal IQ
SB5 uniquely provides a Nonverbal IQ (NVIQ) and Verbal IQ (VIQ) in addition to the FSIQ. Large discrepancies between NVIQ and VIQ suggest learning differences or English language learner status.
Recommended Books
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Assessing Gifted Children: Practical Guide for Parents
Comprehensive parent guide to understanding IQ testing and gifted identification.
Frequently Asked Questions
What is the Stanford-Binet 5?
The Stanford-Binet Intelligence Scales, 5th Edition (SB5) is an individually administered IQ test covering ages 2 through 85+. It measures five cognitive factors and produces a Full-Scale IQ (FSIQ) and five Factor IQ scores.
How is the SB5 different from the WISC-V?
Both measure IQ, but the SB5 covers a wider age range (2–85+) vs. WISC-V (6–16). The SB5 uses a different factor structure (5 factors vs. WISC-V's 5 indexes). The SB5 is preferred for very young children and for extended norms testing of profoundly gifted individuals.
What are extended norms?
Standard IQ tests have a ceiling — they can't reliably distinguish between IQ 150 and IQ 180. SB5 Extended Norms extend the scale to measure profoundly gifted individuals (IQ 160+). This is important for appropriate educational placement for highly gifted children.
What is the SB5 used for in schools?
The SB5 is used for gifted identification, special education eligibility, learning disability diagnosis, and neuropsychological assessment. Many independent schools and gifted programs accept SB5 FSIQ scores alongside WISC-V scores.
Can you prepare for the Stanford-Binet?
Like the WISC-V, the SB5 tests underlying cognitive abilities. You cannot study the specific test items (they are confidential). Cognitive enrichment activities — reading, math games, puzzles — support general cognitive development.