Stanford-Binet
Intelligence Test
Complete guide to the Stanford-Binet Intelligence Scales (SB-5): history, structure, administration, scoring and clinical applications. Understand this widely-used professional IQ assessment for children and adults.
Explore the SB-5 →One of the world's most widely-used IQ tests
The Stanford-Binet Intelligence Scales (SB-5) is a professional, clinically-valid assessment of cognitive ability for individuals ages 2–85 years. First published in 1916 by Lewis Terman at Stanford University (based on the original Binet-Simon scales), it has been revised multiple times and remains one of the most respected intelligence assessment instruments in psychology and education. The current version (SB-5, published 2003) provides comprehensive measurement across multiple cognitive domains and is used by psychologists, educators, and clinicians worldwide for diagnosis, placement decisions, and clinical assessment.
Professional-grade assessment
Unlike free online tests, the Stanford-Binet is: Clinically normed and validated on large representative samples, Individually administered by trained examiners, Comprehensive across multiple cognitive domains, Admissible in legal and educational contexts, and Suitable for clinical diagnosis and identification. The SB-5 requires professional training to administer and interpret — it is not a tool for casual online assessment but rather a clinical instrument used in psychological evaluation.
The Stanford-Binet represents over a century of refinement in intelligence assessment, building on the foundational work of Alfred Binet and evolving into a modern, comprehensive cognitive assessment tool.
Binet-Simon Scales Created
Alfred Binet and Théodore Simon develop the first mental ability test in Paris for identifying children needing special education.
Stanford-Binet Published (1st Edition)
Lewis Terman at Stanford University adapts Binet's test for English speakers. Introduces the "Intelligence Quotient" (IQ) formula and establishes American norms.
Second Edition (Form L & M)
Revised and restandardised with improved item selection and updated norms. Forms L and M provide equivalent but independent test versions.
Third Edition (Form L-M)
Combined forms L and M; updated items and norms. Becomes the most widely-used IQ test through the 1970s.
Fourth Edition (SB:FE)
Major revision introducing factor structure, composite scores, and broader cognitive assessment. Renamed "Stanford-Binet Intelligence Scale: Fourth Edition."
Fifth Edition (SB-5) — Current Version
Modern revision with updated norms, item pool, and assessment of five cognitive factors. SB-5 is the current gold-standard professional IQ test for children and adults.
The SB-5 assesses five cognitive factors across verbal, non-verbal and written domains. This multi-factor structure provides a comprehensive profile of cognitive strengths and weaknesses.
Fluid Reasoning
Novel problem-solving, pattern recognition and logical thinking independent of learned knowledge.
Knowledge
Accumulated verbal knowledge, vocabulary, comprehension and learned information.
Quantitative Reasoning
Mathematical reasoning, numerical ability and problem-solving with numbers and quantities.
Visual-Spatial Processing
Spatial relationships, mental imagery, visual analysis and non-verbal reasoning.
Working Memory
Short-term memory, attention, concentration and ability to hold and manipulate information.
Comprehensive assessment across domains
The SB-5 contains 10 subtests (5 verbal, 5 non-verbal) that measure these five factors. Testing takes 45–90 minutes depending on the individual and the examiner's thoroughness. Results provide: Full Scale IQ (FSIQ) representing overall cognitive ability, Verbal IQ (VIQ) measuring language-based reasoning, Non-Verbal IQ (NVIQ) measuring visual-spatial and abstract reasoning, and Factor scores for each of the five cognitive domains. This multi-dimensional approach identifies cognitive strengths and specific areas of weakness, making it ideal for diagnosis and educational planning.
🎓 Giftedness Identification
Gold standard for identifying academically gifted children. Scores 130+ qualify for gifted programs in most districts.
🏥 Clinical Diagnosis
Assesses cognitive disability, intellectual disability and developmental delay. Results inform intervention planning.
🧑⚖️ Legal Assessment
Results admissible in legal proceedings, special education hearings and court cases involving cognitive capacity.
📚 Educational Placement
Determines appropriate educational level, special education services and accommodation needs.
🔬 Research
Widely used in cognitive psychology and neuroscience research. Gold standard for research participant screening.
💼 Career Assessment
Sometimes used in career counselling, vocational rehabilitation and job placement evaluations.
Multiple professional IQ tests exist. Each has strengths and is used in different contexts. The Stanford-Binet distinguishes itself through its comprehensive structure and long historical track record.
Stanford-Binet (SB-5)
- 5 cognitive factors measured
- 45–90 minute administration
- Ages 2–85 covered
- Strong for giftedness ID
- Excellent verbal/non-verbal balance
- Longest historical track record (100+ years)
- Gold standard in many settings
WAIS-IV (Wechsler)
- 4 index scores measured
- 60–90 minute administration
- Ages 16–90 covered
- Excellent for working adults
- Strong process/deficit analysis
- Slightly more popular in clinical settings
- Detailed subtest profile analysis
Choosing between Stanford-Binet and WAIS
Use Stanford-Binet for: Young children (under 16), giftedness screening, comprehensive cognitive profile, non-verbal ability emphasis. Use WAIS for: Adults and adolescents, detailed deficit analysis, working memory emphasis, high-level cognitive screening. Many psychologists use both within a broader assessment battery.
Professional administration required
The Stanford-Binet can only be administered by a qualified professional: psychologists, educational psychologists, school psychologists, clinical assessors and others with specialized training. It is not a self-administered test and requires licensing to purchase and use. A trained examiner: establishes rapport with the test-taker, administers items in a standardised way, observes behaviour and motivation, scores responses immediately, and interprets results contextually.
| Subtest | Factor Measured | Task Type | Time |
|---|---|---|---|
| Verbal Subtests | |||
| Vocabulary | Knowledge | Define words | ~5 min |
| Comprehension | Knowledge | Explain concepts | ~5 min |
| Absurdities | Fluid Reasoning | Identify logical errors | ~5 min |
| Verbal Analogies | Fluid Reasoning | Complete analogies | ~5 min |
| Number Series | Quantitative Reasoning | Continue number patterns | ~5 min |
| Non-Verbal Subtests | |||
| Object Series/Matrices | Fluid Reasoning | Complete visual patterns | ~5 min |
| Quantitative (Non-Verbal) | Quantitative Reasoning | Solve numerical problems nonverbally | ~5 min |
| Picture Absurdities | Fluid Reasoning | Identify visual errors | ~5 min |
| Matrices | Visual-Spatial Processing | Complete matrix patterns | ~5 min |
| Paper Folding | Visual-Spatial Processing | Mental paper-folding tasks | ~5 min |
Scoring and interpretation
Raw scores are converted to scaled scores (mean 10, SD 3) by age group. Composite scores are calculated for each factor and overall domains, yielding standard scores (mean 100, SD 15) with percentile ranks and confidence intervals. Interpretation considers: overall cognitive ability (FSIQ), verbal vs. non-verbal strengths, factor-specific strengths and weaknesses, scatter patterns suggesting learning disabilities or giftedness, behavioral observations, and clinical impressions. Results are typically provided in a detailed psychological report with recommendations for intervention, accommodation or further evaluation.
About professional vs. online assessment
The Stanford-Binet is a professional assessment requiring qualified administration. If you're seeking cognitive assessment: for clinical diagnosis, legal proceedings or educational placement, work with a licensed psychologist. For general self-knowledge and cognitive screening, online assessments provide valuable information. Both have distinct purposes and value — they complement rather than replace each other.