SlowcoachOverall IQ is often the most noticeable number on a Wechsler intelligence test report. But one number cannot explain a person's everyday life, and higher or lower index scores should not be turned directly into a personality profile or a chart of job suitability.
We should look beyond overall IQ, but we should not translate differences between indices directly into a person's strengths, weaknesses or suitability for a job either.
Consider a fictional example. At his feedback appointment, an adult named Jihun receives his overall IQ and four index scores. Hearing that one index is lower than another, he asks, “Does this mean I can never do work that requires speed?” At work, however, he completes familiar data-entry tasks accurately. He often loses his place only when a phone call interrupts him or an instruction changes midway through the task.
A more useful question is: “Under what conditions did the difference appear, do similar situations recur in everyday life, and what changes might make a difference?”
1. Should we check the test name before reading the report?
First, check the exact test name, edition and norms used, usually shown at the top of the report.
In the Inpsyt product information checked on 8 September 2026, the K-WAIS-IV is an individually administered assessment for adolescents and adults aged 16 years 0 months to 69 years 11 months, with an estimated administration time of approximately 80-100 minutes.[1] The K-WISC-V is an individual clinical instrument for children aged 6 years 0 months to 16 years 11 months.[2]
Despite their similar names, the two tests do not have the same structure. An adult K-WAIS-IV report can show indices such as Verbal Comprehension, Perceptual Reasoning, Working Memory and Processing Speed. The child K-WISC-V provides five primary indices: Verbal Comprehension, Visual Spatial, Fluid Reasoning, Working Memory and Processing Speed.[1][2][5]
You should therefore not compare your report with someone else's box by box without checking these differences. Where the age ranges overlap, particularly at age 16, the appropriate test depends on the assessment purpose and professional judgement.[11]
An online test that immediately displays a number cannot be interpreted as equivalent to a formal K-WAIS-IV or K-WISC-V result unless its test name, Korean norms, standardised administration procedures and professional interpretation have been established.
2. In what order should we read the scores?
The report becomes less confusing when we separate it into five layers.
First, overall IQ summarises performance across several core subtests. It does not explain why a particular task was difficult on that day.
Second, index scores summarise cognitive domains by combining several subtests. “A low Working Memory Index” should not become “poor memory in every everyday situation.”
Third, subtest scores show performance on more specific tasks. A single low score does not establish a separate deficit or diagnosis, and these scores may be more affected by task characteristics and measurement error.
Fourth, look at percentiles and confidence intervals. A percentile is not the percentage of questions answered correctly; it is a relative position within the same-age normative group. A 95% confidence interval helps prevent us from reading a score as a single point without error.[4]
Fifth, consider behavioural observations and interviews from the assessment, developmental, educational and health information, and everyday performance. Whether the person had barely slept, whether language, hearing or motor conditions affected a task, and how difficulties recur at home, school or work are questions beyond the table of numbers.
3. Why ask about confidence intervals?
Even if overall IQ is printed prominently as one number, a test does not identify a person's “true score” without error. For the same score on the same test, the standard error of measurement may vary by age and score type. An arbitrary “plus or minus a few points” found online should not be attached to your own result.
AAIDD's guidance on the definition and classification of intellectual disability explains that interpreting intellectual functioning and adaptive behaviour scores requires consideration of 95% confidence intervals based on the standard error of measurement of the particular individual test.[4]
A confidence interval is not a certificate that the “true score is definitely inside this range.” It is a way of taking measurement error into account and reading a score as a range rather than a single point.
At a feedback appointment, you can ask, “What is the 95% confidence interval for this score?” and “If it overlaps a classification boundary, what additional information do you consider?” These questions matter particularly when a score falls just above or below a threshold.
4. Do large index differences reveal true strengths and weaknesses?
Three questions need to be separated when looking at differences between indices.
First, is the score difference statistically significant? Second, how often does a difference of that size occur in the same-age normative group? Third, do interviews, behavioural observations and situations at school or work support the same hypothesis?
The US WAIS-IV publisher's FAQ advises checking both statistical significance and frequency in the normative group before interpreting score differences, and treating an unusual difference as a starting point for confirming or challenging further hypotheses.[5] Difference values and base rates for the Korean edition need to be checked separately with the assessor.
A statistically significant index difference is not the same as a difference that is unusual and appears in everyday life in the same way.
Research on profile interpretation itself also calls for caution. De Jong analysed Dutch WISC-V data and simulations. Depending on the index, observed index differences were accompanied by differences in the underlying broad factors they were intended to measure in 40-74% of cases. The researcher concluded that evidence supporting the clinical use of WISC-V profiles of strengths and weaknesses was limited.[6]
These figures cannot be transferred directly to the K-WAIS-IV for Korean adults: the study concerned a children's test, the Dutch edition and simulations. They nevertheless provide an important reason not to treat the peaks and valleys of a score profile as a fixed map of an individual's abilities.
5. How should test scores connect to everyday life?
Intelligence testing and adaptive behaviour assessment answer different questions. AAIDD describes adaptive behaviour in terms of how conceptual, social and practical skills are ordinarily performed at home, school, work and during leisure.[4] The Korea National Institute of Special Education's list of assessment tools also distinguishes intellectual ability and cognitive assessments from adaptive behaviour assessments.[3]
This does not mean that an adaptive behaviour assessment is always more important than an intelligence test. Nor does it mean that borderline intellectual functioning is the same as intellectual disability. It means that diagnosis and support decisions should not end with one type of score.
For Jihun, we would not conclude, “His processing speed is low, so he cannot do fast-paced work.” Instead, we would turn the hypothesis into situations to examine in everyday life.
- What was observed in the test: relatively lower performance on particular visual tasks under a time limit
- Situations to check: whether familiar data entry, unfamiliar tasks and tasks interrupted by telephone calls differ
- Support to try: handling one batch at a time, providing a completed example and marking the point to return to after an interruption
- Changes to observe: number of errors, number of repeated explanations, proportion of independent restarts and completion time
These four lines are neither a diagnosis nor a standardised adaptive behaviour assessment. They are workplace notes that turn test findings into low-risk support hypotheses that can be checked in a real environment, rather than using the findings to determine job suitability.
6. How can we ask where to take a test and what it costs?
Inpsyt's K-WAIS-IV product information specifies individual administration, approximately 80-100 minutes and restrictions on who is qualified to purchase the test materials.[1] Its administration is therefore different from a test anyone can complete alone online and expect to receive an equivalent result.
Page 220 of the Health Insurance Review and Assessment Service's 2026 list of procedures includes intelligence testing under item Na-620(a), code F6201, with a relative value of 463.11 points.[7] A 2010 administrative interpretation concerning the K-WISC-III described subtest administration, synthesis, analysis and production of results as one fee-assessment process at that time.[8]
These two documents show codes and billing structures; they do not establish an individual's current insurance coverage or out-of-pocket charge. Ask the booking institution whether the test is standalone or part of a comprehensive psychological assessment, whether a report, feedback consultation and additional tests are included, and what the expected total cost is. Prices at psychological centres outside hospitals cannot be explained by the same classification table either.
Even among publicly available 2026 examples, the same KRW 200,000 covers different things. Davos Hospital's non-covered fee notice lists standalone K-WPPSI-IV and K-WISC-V tests at KRW 200,000 each, without specifying whether feedback and a report are included.[9] Jungwon Youth Center lists a comprehensive psychological assessment for children and adolescents at KRW 200,000, combining the K-WISC-V, an emotional assessment, a feedback consultation and a psychological assessment report.[10] The same amount can cover different components, and neither example can be generalised into a national average or a price for adult K-WAIS-IV testing.
Before booking, it is therefore more precise to ask the following questions together than simply, “How much does a Wechsler test usually cost?”
- What is the exact test name and Korean edition?
- Is this an intelligence test alone, or part of a comprehensive psychological assessment?
- Are a written report and feedback consultation included, and how long does each take?
- What is the expected total, including additional tests, the initial appointment and consultation fees?
- If this is a medical institution, how will eligibility for health insurance coverage be checked?
- What are the qualifications and roles of the person administering the test and the person providing the final interpretation?
The price of a test kit and health insurance relative value points are not the price a consumer pays for an assessment. Compare quotations that include the same components.
7. What should we write down at the feedback appointment?
You can bring the following questions in a note on your phone when the results are explained.
1. Which score provides the most reliable summary of my results?
2. What is the confidence interval for each score?
3. Are the index differences statistically significant? How common are they in the normative group?
4. Do observations during testing and information from the interview support or challenge those differences?
5. What further situations should we examine at home, school or work?
6. If we try one form of support, what should we record, and how?
Before leaving the feedback appointment, it can be more useful to write one sentence each about the everyday situations to examine further, the support to try and the changes to observe than to write down score names alone.
A report should help us ask more precise next questions, rather than reduce a person to a single number. The central point is not to turn any one box on the report into the whole person.
For more on the difference between IQ ranges and adaptive functioning, see “Is an IQ of 70-85 the criterion for borderline intellectual functioning?”
https://blog.naver.com/samuel_oh_/224375453449
For the distinction between changes in scores and changes in actual work, see “Can IQ scores change for people with borderline intellectual functioning?”
https://blog.naver.com/samuel_oh_/224380663901
Slowcoach does not administer Wechsler tests or interpret individual results. Rather than classify people by test scores, we are exploring how to record recurring situations at work and adjust explanations, sequences, examples and ways to ask for help. Whether that support increases independent performance remains a hypothesis to be tested.
https://inpsyt.co.kr/psy/item/view/PITM000071
https://inpsyt.co.kr/psy/item/view/KWISC5_CO_TG
https://www.nise.go.kr/ebook/src/viewer/download.php?host=main&no=1&site=20251222_141341
https://journals.sagepub.com/doi/10.1177/07342829221150868
https://www.hira.or.kr/ebooksc/2026/03/BZ202603053039374.pdf
https://www.davoshospital.co.kr/guide/page07.html?cate1=&cate2=&hp_type=&np_item=&page=15
https://www.snyouth.or.kr/File/Download/1b79994ce6301a62925b0ce14648a305