The Wechsler Intelligence Scale for Children (WISC) is the world's most widely used IQ test for children aged 6–16. This comprehensive guide covers the complete history of the WISC, the key differences between WISC-IV and WISC-V, and what you need to know about testing in Augusta.
Last Updated: August 2026
From Wechsler-Bellevue (1939) to WISC-V (2014) – the evolution of child intelligence testing.
Detailed comparison of the current and previous versions. What changes, what stays the same.
How many children take the WISC in Augusta and what the data tells us about the city.
Complete breakdown of subtests and index scores for WISC, WISC-R, WISC-III, WISC-IV, and WISC-V.
Understanding the advantages of the newest version and why it's the current gold standard.
Book your child's WISC assessment with a licensed psychologist in Augusta today.
The story of the WISC begins like the WAIS – with David Wechsler, Chief Psychologist at Bellevue Hospital in New York City. In 1939, Wechsler published the Wechsler-Bellevue Intelligence Scale, which was revolutionary for its time. Wechsler believed that intelligence was not a single, monolithic entity but rather "the global capacity of a person to act purposefully, to think rationally, and to deal effectively with his environment."
Wechsler's test differed from the Stanford-Binet scale in several crucial ways:
Following the success of the Wechsler-Bellevue for adults, Wechsler published the original WISC in 1949. It was specifically designed for children aged 5–15 and consisted of five verbal subtests and five performance subtests. The test produced Verbal IQ, Performance IQ, and Full Scale IQ scores.
The WISC-R was released in 1974 and was a significant revision. It updated the norms, improved the test items, and extended the age range to 6–16. The WISC-R also introduced improved administration and scoring procedures.
The WISC-III brought significant changes in 1991. It introduced four secondary factor indexes: Verbal Comprehension, Perceptual Organization, Freedom from Distractibility, and Processing Speed. New subtests were added, including Symbol Search and Mazes, while some older subtests were revised.
The WISC-IV was released in 2003 and represented a major evolution. The verbal/performance IQ scores were removed and replaced by four index scores:
New subtests were added, and some were removed. The test was also updated to better align with current cognitive theory.
The current version, WISC-V, was released in 2014 and represents the most comprehensive revision to date. It introduced a five-factor model, with the Perceptual Reasoning Index split into two separate indices:
WISC-V also introduced new subtests and updated the normative data to reflect the current population.
WISC-V is the current gold standard for child IQ testing and offers several significant improvements over previous versions.
RCSS provides gifted services at all grade levels and uses CogAT universal screening to identify students who may need further evaluation. A private WISC-V report may describe the child’s profile but does not replace district procedures.
Georgia identification may use mental ability, achievement, creativity, and motivation criteria. Educational response can include differentiation, gifted service models, magnet programs, advanced courses, enrichment, or acceleration.
Magnet and specialized schools, AP, dual enrollment, career technical education, arts, and STEM programs use their own criteria and deadlines. Course readiness and achievement commonly matter more than one IQ score.
Georgia Psychology & Counseling provides intellectual and academic testing for children and teens. School evaluation teams, NeuroBehavioral Associates, Augusta University/Wellstar MCG Health, and other specialists may be appropriate for educational, developmental, or medical questions.
Interpret language exposure, school transitions, military moves, attendance, instruction, disability, achievement, and emotional factors. Nonverbal measures or broader language assessment may be needed when English exposure limits verbal-score interpretation.
Frequent moves, changes in curriculum, deployment stress, interrupted services, and differing gifted or special-education rules can affect performance and school records. The evaluator should distinguish underlying reasoning ability from transition effects and document prior instruction, attendance, interventions, and testing history.
The WISC was created by David Wechsler, Chief Psychologist at Bellevue Hospital in New York. Its development is a story of innovation that began in 1939 and continues today.
Wechsler's original definition of intelligence as "the global capacity of a person to act purposefully, to think rationally, and to deal effectively with his environment" remains influential to this day.
WISC-V is a significant update that brings the test in line with modern cognitive theory and practice. Key differences include:
The WISC is not designed to detect ADHD directly. It is an IQ test, and ADHD is a clinical diagnosis based on behavioral symptoms like inattention, hyperactivity, and impulsivity.
However, the WISC can be a valuable tool in the ADHD assessment process. It can reveal cognitive patterns often associated with the disorder:
A significant discrepancy between the General Ability Index (GAI) and the Cognitive Proficiency Index (CPI) is also a pattern often seen in ADHD evaluations. Ultimately, the WISC helps clinicians rule out other causes of cognitive difficulties and provides crucial context, but a formal ADHD diagnosis requires a comprehensive clinical evaluation.
The language used to describe IQ scores has evolved significantly, moving away from outdated and potentially stigmatizing terms.
These changes reflect a broader effort to ensure that the language used in psychological assessments is respectful, clear, and accurately communicates a child's cognitive profile without causing confusion or stigma.
WISC-V takes approximately 65-80 minutes to administer, depending on the child's age and the number of subtests administered.
WISC-V results may be considered as one source of evidence, but Augusta-area districts and private schools set their own instruments, deadlines, score-age rules, and multiple-measure criteria. A 98th-percentile score is a common traditional gifted reference, not an automatic local placement rule.
WISC is for children aged 6-16. WAIS is for adults aged 16-90. WISC-V and WAIS-IV have different subtests, norms, and index structures.
Typical fees range from $200 to $1,200. Some insurance plans cover testing when medically necessary.
Some interviews and feedback can occur remotely, but WISC testing must follow publisher, legal and professional requirements; many subtests and school uses require in-person administration. Confirm the administration format with the selected psychologist before scheduling.