Classification Criteria:
✔️ Scientific validity and reliability (correlation with general intelligence “g”)
✔️ Comprehensive assessment of cognitive functions (fluid intelligence, crystallized intelligence, memory, processing speed, etc.)
✔️ Global acceptance by psychology boards
✔️ Updated versions and clinical/educational applicability
✔️ Suitability for different populations (neurodivergence, age, language, etc.)
1️⃣ Wechsler Adult Intelligence Scale (WAIS-IV, WAIS-V)
✔️ Gold standard for assessing intelligence in adults (16+ years)
✔️ “g” factor: High correlation (~0.9) with general intelligence
✔️ Versions: WAIS-IV (2008), WAIS-V (2023, available in some countries)
✔️ Coverage: fluid intelligence, crystallized intelligence, working memory, processing speed, visuospatial reasoning, verbal abilities
✔️ Universally accepted by psychology boards
✔️ Used for: Clinical diagnosis, research, giftedness, neurocognitive disorders
❌ Cannot be taken online
💡 Comment: The WAIS is the most comprehensive and widely accepted test for adults, serving as a global reference.
2️⃣ Wechsler Intelligence Scale for Children (WISC-V)
✔️ Gold standard for children and adolescents (6 to 16 years old)
✔️ “g” factor: High correlation (~0.9) with general intelligence
✔️ Versions: WISC-V (2014)
✔️ Coverage: verbal and nonverbal reasoning, working memory, processing speed, visuospatial skills
✔️ Globally accepted for clinical diagnoses, learning disabilities, and giftedness
❌ Cannot be taken online
💡 Comment: The WISC-V is essential for identifying ADHD, learning disabilities and high abilities.
3️⃣ Stanford-Binet Intelligence Scales (SB-5)
✔️ “g” factor: High correlation (~0.9) with general intelligence
✔️ Versions: Stanford-Binet 5 (2003, periodic revision of standards)
✔️ Coverage: fluid reasoning, knowledge, quantitative reasoning, visuospatial processing, working memory
✔️ Used for children, adolescents and adults
✔️ Accepted for diagnosis of giftedness
❌ Cannot be taken online
💡 Comment: Stanford-Binet is an excellent alternative to WAIS and WISC.
4️⃣ Woodcock-Johnson IV Tests of Cognitive Abilities (WJ-IV COG)
✔️ “g” factor: High correlation (~0.85) with general intelligence
✔️ Versions: WJ-IV (2014)
✔️ Coverage: fluid intelligence, crystallized intelligence, processing speed, memory, quantitative reasoning, auditory processing
✔️ Used for learning disabilities and neuropsychological assessments
❌ Cannot be taken online
💡 Comment: The WJ-IV is widely used in educational and cognitive assessments.
5️⃣ Wechsler Abbreviated Scale of Intelligence (WASI-II)
✔️ Abbreviated test based on WAIS and WISC
✔️ “g” factor: Moderate-high correlation (~0.85)
✔️ Versions: WASI-II (2011)
✔️ Quick application (30-45 min) for initial IQ screening
✔️ Good for general intelligence estimates, but does not replace full tests
❌ Cannot be taken online
💡 Comment: The WASI-II is useful for rapid screening, but does not replace WAIS or WISC for detailed diagnostics.
6️⃣ Reynolds Intellectual Assessment Scales (RIAS-2)
✔️ “g” factor: High correlation (~0.8)
✔️ Versions: RIAS-2 (2017)
✔️ Quick but effective measurement of general, fluid, and crystallized intelligence
✔️ Less comprehensive than WAIS and Stanford-Binet, but valid for clinical diagnoses
❌ Cannot be taken online
💡 Comment: The RIAS-2 is efficient for quick assessments, but it does not replace the main tests.
7️⃣ Kaufman Assessment Battery for Children (KABC-II)
✔️ “g” factor: Moderate correlation (~0.75)
✔️ Versions: KABC-II (2004)
✔️ Very useful for neurodivergent children (ASD, ADHD, learning disabilities)
✔️ Used for clinical and educational assessments
❌ Cannot be taken online
💡 Comment: The KABC-II is excellent for children with language or auditory processing difficulties.
8️⃣ Differential Ability Scales (DAS-II)
✔️ “g” factor: Moderate correlation (~0.75)
✔️ Versions: DAS-II (2007)
✔️ Good for giftedness and learning disabilities
❌ Cannot be taken online
💡 Comment: The DAS-II is less widely used globally than the WISC, but is still valid.
9️⃣ Raven’s Progressive Matrices (APM, SPM, CPM) – Supervised Version
✔️ “g” factor: Moderate correlation (~0.7)
✔️ Measures only fluid intelligence
✔️ Useful for giftedness screening
❌ Cannot be reliably administered online
💡 Comment: Raven’s should not be used alone to measure IQ, as it does not assess crystallized intelligence, memory or executive functions.
🔟 Universal Nonverbal Intelligence Test (UNIT-2)
✔️ Nonverbal test for ASD and language-impaired populations
✔️ Less comprehensive than WAIS or Stanford-Binet
❌ Cannot be taken online
💡 Comment: UNIT-2 is useful for populations with language difficulties, but it is not a substitute for more comprehensive tests.
Conclusion
The WAIS, WISC, and Stanford-Binet remain the most comprehensive and widely accepted IQ tests worldwide.
The WJ-IV and WASI-II are good alternatives for quick assessments.
Raven’s is useful, but it is not a substitute for more comprehensive tests.
The choice of test should consider the target population and the objectives of the assessment.