View source for Wechsler Adult Intelligence Scale

{{Short description|IQ test designed to measure intelligence in adults}}
{{Use dmy dates|date=January 2023}}
{{Infobox diagnostic
| Name = Wechsler Adult Intelligence Scale
| lo
Image =
| Caption = ICD10       =
| name = Wechsler Adult Intelligence Scale
| synonyms = WAIS
| ICD9 = {{ICD9proc|94.01}}
| MeshID = D014888
| OPS301 =
| OtherCodes =
| HCPCSlevel2 =
}}
The '''Wechsler Adult Intelligence Scale''' ('''WAIS''') is an [[IQ test]] designed to measure [[intelligence]] and [[cognitive ability]] in adults and older adolescents.<ref name="KaufmanLichtenberger2006">{{Cite book |title=Assessing Adolescent and Adult Intelligence |last1=Kaufman |first1=Alan S. |last2=Lichtenberger |first2=Elizabeth |author-link1=Alan S. Kaufman |edition=3rd |year=2006 |publisher=Wiley |location=Hoboken (NJ) |isbn=978-0-471-73553-3}}</ref> For children between the ages of 6 and 16, [[Wechsler Intelligence Scale for Children]] (WISC) is commonly used.
The original WAIS (Form I) was published in February 1955 by [[David Wechsler]], Chief Psychologist at [[Bellevue Hospital]] (1932–1967) in NYC, as a revision of the Wechsler–Bellevue Intelligence Scale released in 1939.<ref name="KaufmanLichtenberger2006p7">{{Cite book |title=Assessing Adolescent and Adult Intelligence |last1=Kaufman |first1=Alan S. |last2=Lichtenberger |first2=Elizabeth |author-link1=Alan S. Kaufman |edition=3rd |year=2006 |publisher=Wiley |location=Hoboken (NJ) |isbn=978-0-471-73553-3|page=7 }}</ref> It is currently in its fifth edition (''WAIS-5''), released in 2024 by [[Pearson PLC|Pearson]]. It is the most widely used IQ test, for both adults and older adolescents, in the world.<ref name=":0">{{Cite journal |last=Kaufman |first=Alan S. |last2=Flanagan |first2=Dawn P. |last3=Alfonso |first3=Vincent C. |last4=Mascolo |first4=Jennifer T. |date=September 2006 |title=Test Review: Wechsler Intelligence Scale for Children, Fourth Edition (WISC-IV) |url=http://journals.sagepub.com/doi/10.1177/0734282906288389 |journal=Journal of Psychoeducational Assessment |language=en |volume=24 |issue=3 |pages=278–295 |doi=10.1177/0734282906288389 |issn=0734-2829}}</ref><ref>{{Cite web |title=Wechsler Adult Intelligence Scale {{!}} Fifth Edition |url=https://www.pearsonassessments.com/store/usassessments/en/Store/Professional-Assessments/Cognition-%26-Neuro/Wechsler-Adult-Intelligence-Scale-%7C-Fifth-Edition/p/P100071002.html |access-date=2024-02-06 |website=www.pearsonassessments.com |language=en}}</ref>
==History==
The WAIS was founded to get to know Wechsler's patients at Bellevue Hospital and on his definition of [[intelligence]], which he defined as  "... the global capacity of a person to act purposefully, to think rationally, and to deal effectively with his environment."<ref>{{Cite book |title=The Measurement of Adult Intelligence |last=Wechsler |first=David |author-link=David Wechsler |year=1939 |publisher=Williams & Witkins |location=Baltimore (MD) |page=229 }} <!-- Verification was requested and found on http://www.indiana.edu/~intell/wechsler.shtml--></ref> He believed that intelligence was made up of specific elements that could be isolated, defined, and subsequently measured. However, these individual elements were not entirely independent, but were all interrelated. His argument, in other words, is that general intelligence is composed of various specific and interrelated functions or elements that can be individually measured.<ref name = Kaplan>{{cite book | last1 = Kaplan | first1 = R. M. | last2 = Saccuzzo | first2 = D. P. | year = 2010 | title = Psychological Testing: Principles, Applications, & Issues | edition = 8th | location = Belmont, CA | publisher = Wadsworth, Cengage learning}}</ref>
This theory differed greatly from the [[Binet-Simon Intelligence Test]] which, in Wechsler's day, was generally considered the supreme authority with regard to intelligence testing. A drastically revised new version of the Binet scale, released in 1937, received a great deal of criticism from [[David Wechsler]] (after whom the original Wechsler–Bellevue Intelligence scale and the modern Wechsler Adult Intelligence Scale IV are named).<ref name = Kaplan />
* Wechsler was a very influential advocate for the concept of non-intellective factors, and he felt that the 1937 Binet scale did not do a good job of incorporating these factors into the scale (non-intellective factors are variables that contribute to the overall score in intelligence, but are not made up of intelligence-related items. These include things such as lack of confidence, fear of failure, attitudes, etc.).
* Wechsler did not agree with the idea of a single score that the Binet test gave.<ref name = Kaplan />
* Wechsler argued that the Binet scale items were not valid for adult test-takers because the items were chosen specifically for use with children.<ref name = Kaplan />
* The "Binet scale's emphasis on speed, with timed tasks scattered throughout the scale, tended to unduly handicap older adults."<ref name = Kaplan />
* Wechsler believed that "mental age norms clearly did not apply to adults."<ref name = Kaplan />
* Wechsler criticized the then existing Binet scale because "it did not consider that intellectual performance could deteriorate as a person grew older."<ref name = Kaplan />
These criticisms of the 1937 Binet test helped produce the Wechsler–Bellevue scale, released in 1939. However, the present-day WAIS-IV has contradicted many of these criticisms, by incorporating a single overall score, using multiple timed tasks, focusing on intellective items and other ways. While this scale has been revised (resulting in the present day WAIS-IV), many of the original concepts Wechsler argued for have become standards in [[psychological testing]], including the point-scale concept and the performance-scale concept.<ref name = Kaplan />
==Wechsler–Bellevue Intelligence Scale==
The Wechsler–Bellevue tests were innovative in the 1930s because they:
# gathered tasks created for nonclinical purposes for administration as a "clinical test battery",<ref>{{Cite book |title=Assessing Adolescent and Adult Intelligence |last1=Kaufman |first1=Alan S. |last2=Lichtenberger |first2=Elizabeth |author-link1=Alan S. Kaufman |edition=3rd |year=2006 |publisher=Wiley |location=Hoboken (NJ) |isbn=978-0-471-73553-3 |page=6 }}</ref>
# used the point scale concept instead of the age scale, and
# included a non-verbal performance scale.<ref>{{cite book |title=IQ Testing 101 |last=Kaufman |first=Alan S. |author-link=Alan S. Kaufman |year=2009 |publisher=Springer Publishing |location=New York |isbn=978-0-8261-0629-2 |page=112}} {{cite book |title=Assessment of Children: Cognitive Foundations |last=Sattler |first=Jerome M. |year=2008 |publisher=Jerome M. Sattler, publisher |location=La Mesa (CA) |isbn=978-0-9702671-4-6 |at=inside back cover}}</ref>
=== Point scale concept ===
In the [[Alfred Binet|Binet]] scales (prior to the 1986 version) items were grouped according to age level. Each of these age levels was composed of a group of tasks that could be passed by two-thirds to three-quarters of the individuals in that level. This meant that items were not arranged according to content. Additionally, an individual taking a Binet test would only receive credit if a certain number of the tasks were completed. This meant that falling short just one task required for the credit, resulted in no credit at all (for example, if passing three out of four tasks was required to receive credit, then passing two yielded no credit).<ref name = Kaplan />
The point scale concept significantly changed the way testing was done by assigning credits or points to each item. This had two large effects. First, this allowed items to be grouped according to content. Second, participants were able to receive a set number of points or credits for each item passed.<ref>{{cite book | last1 = Kaplan | first1 = R. M. | last2 = Saccuzzo | first2 = D. P. | year = 2009 | title = Psychological testing: Principles, applications, and issues | edition=7th | location = Belmont, CA | publisher = Wadsworth}}</ref> The result was a test that could be made up of different content areas (or subtests) with both an overall score and a score for each content area. In turn, this allowed for an analysis to be made of an individual's ability in a variety of content areas (as opposed to one general score).<ref name = Kaplan />
===The Non-Verbal Performance Scale===
The non-verbal performance scale was also a critical difference from the Binet scale. The earlier Binet scale had been persistently and consistently criticized for its emphasis on language and verbal skills.<ref name=Kaplan /> Wechsler designed an entire scale that allowed the measurement of non-verbal intelligence. This became known as a performance scale. This scale required a subject to actively do something, such as copying symbols or pointing to a missing detail in a picture, rather than just answering questions. This was an important development, as it attempted to overcome biases that were caused by "language, culture, and education."<ref name=Kaplan /> Further, this scale also provided an opportunity to observe a different type of behavior, because something physical was required. Clinicians were able to observe how a participant reacted to the "longer interval of sustained effort, concentration, and attention" that the performance tasks required.<ref name=Kaplan />
As the Wechsler–Bellevue scale was the first to effectively use the performance scale, it also introduced the "possibility of directly comparing an individual's verbal and nonverbal intelligence".<ref name=Kaplan /> This was possible as "the results of both scales were expressed in comparable units".<ref name=Kaplan /> The Binet scale did have performance tasks, but they were geared toward younger children. The Wechsler-Bellevue was also unique in that there were entire tests that were considered supplements or alternatives, including "performance" measures such as the Leiter International Performance Scale.<ref name=Kaplan />
==WAIS==
The WAIS was initially created as a revision of the Wechsler–[[Bellevue Hospital Center|Bellevue]] Intelligence Scale (WBIS), which was a battery of tests published by Wechsler in 1939. The WBIS was composed of subtests that could be found in various other intelligence tests of the time, such as [[Robert Yerkes]]' army testing program and the [[Alfred Binet|Binet]]-[[Théodore Simon|Simon]] scale. The WAIS was first released in February 1955 by [[David Wechsler]]. Because the Wechsler tests included non-verbal items (known as ''performance scales'') as well as verbal items for all test-takers, and because the 1960 form of [[Lewis Terman]]'s [[Stanford–Binet Intelligence Scales]] was less carefully developed than previous versions, Form I of the WAIS surpassed the Stanford–Binet tests in popularity by the 1960s.<ref name="KaufmanLichtenberger2006p7" />
==WAIS-R==
[[File:Cubes de kohs utilisés dans la Wais - R avec un exemple de figure à 4 cubes.jpg|thumb|Cubes and a target pattern of the WAIS-R's "Block Design" test]]
The WAIS-R, a revised form of the WAIS, was released in 1981 and consisted of six verbal and five performance subtests. The verbal tests were: Information, Comprehension, Arithmetic, Digit Span, Similarities, and Vocabulary. The Performance subtests were: Picture Arrangement, Picture Completion, Block Design, Object Assembly, and Digit Symbol. A verbal IQ, performance IQ and full scale IQ were obtained.<ref name="urlWAIS-R"/>
This revised edition did not provide new validity data, but used the data from the original WAIS; however new norms were provided, carefully stratified.<ref name="urlWAIS-R">{{cite web |url=http://www.cps.nova.edu/~cpphelp/WAIS-R.html |title=Wechsler Adult Intelligence Scale—Revised |work= LIST OF TESTS Available from the CPS Testing Library | publisher = Center for Psychological Studies at [[Nova Southeastern University]] | access-date=2009-03-31}}</ref>
==WAIS-III==
{{Unreferenced section|date=November 2016}}
[[File:Wechsler Adult Intelligence Scale subscores and subtests.png|thumb|center|650px]]
The WAIS-III, a subsequent revision of the WAIS and the WAIS-R, was released in 1997. It provided scores for Verbal IQ, Performance IQ, and Full Scale IQ, along with four secondary indices (Verbal Comprehension, Working Memory, Perceptual Organization, and Processing Speed). Some new contributors to the third edition of the most commonly used test of intellectual abilities include Hsin‐Yi Chen, Louise O’Donnell, Mark Ledbetter, David Tulsky, and Jianjun Zhu.<ref>{{Citation |title=Introduction |date=2008 |url=https://doi.org/10.1007/978-1-4020-8164-4_1 |work=High-Resolution If-To-Baseband ΣΔ Adc For Car Radios |pages=1–9 |editor-last=Silva |editor-first=Paulo G. R. |access-date=2023-12-03 |series=Analog Circuits And Signal Processing |place=Dordrecht |publisher=Springer Netherlands |language=en |doi=10.1007/978-1-4020-8164-4_1 |isbn=978-1-4020-8164-4 |editor2-last=Huijsing |editor2-first=Johan H.}}</ref>
===Verbal IQ (VIQ)===
Included seven tests and provided two sub-indices; verbal comprehension and [[working memory]].
The Verbal Comprehension Index (VCI) included the following tests:
* Information
* Similarities
* Vocabulary
The Working Memory Index (WMI) included:
* Arithmetic
* Digit Span
* Letter-Number-Sequencing
Subtest(s) not included in the sub-indices:
* Comprehension
Supplementary subtest(s) (Only to be used for total VIQ index scoring and specified sub-index):
* Letter-Number-Sequencing
===Performance IQ (PIQ)===
Included six tests and it also provided two sub-indices; perceptual organization and processing speed.
The Perceptual Organization Index (POI) included:
* [[Block design test|Block Design]]
* Matrix Reasoning
* Picture Completion
The Processing Speed Index (PSI) included:
* [[Digit Symbol-Coding]]
* Symbol Search
Subtest(s) not included in the sub-indices:
* Picture Arrangement
Supplementary subtests (Only to be used for total PIQ index scoring and specified sub-index):
* Object Assembly
* Symbol Search
==WAIS-IV==
{{More citations needed section|date=November 2016}}
[[File:WAIS-IV test structure.png|thumb|581x581px]]
The current version of the test, the WAIS-IV, which was released in 2008, is composed of 10 core subtests and five supplemental subtests, with the 10 core subtests yielding scaled scores that sum to derive the Full Scale IQ. With the WAIS-IV, the verbal/performance IQ scores from previous versions were removed and replaced by the index scores. The General Ability Index (GAI) was included, which consists of the Similarities, Vocabulary and Information subtests from the [[Verbal Comprehension Index]] and the Block Design, Matrix Reasoning and Visual Puzzles subtests from the [[Perceptual Reasoning Index]].  The GAI is clinically useful because it can be used as a measure of cognitive abilities that are less vulnerable to impairments of processing speed and [[working memory]]. There are several notable features in this version of the intelligence scale that make it unique from previous versions. Some of these changes include the removal of Picture Arrangement, Object Assembly, Mazes, Verbal IQ, and Performance IQ and the addition of five subtests that emphasize fluid reasoning and/or working memory.<ref name=":0" />
===Index scores and scales===
There are four index scores representing major components of intelligence:<ref name=":0" />
* Verbal Comprehension Index (VCI)
* Perceptual Reasoning Index (PRI)
* Working Memory Index (WMI)
* Processing Speed Index (PSI)
Two broad scores, which can be used to summarize general intellectual ability, can also be derived:
* Full Scale IQ (FSIQ), based on the total combined performance of the VCI, PRI, WMI, and PSI. The WAIS-IV can generate an FSIQ in the range of 40 to 160.
* General Ability Index (GAI), based only on the six subtests that the VCI and PRI comprise; it is intended to portray a snapshot of general intelligence that is less influenced by working memory and processing speed demands.
{| class="wikitable" style="width:100%"
|+ WAIS-IV subtests grouped by index
|-
! scope="col" | Index
! scope="col" | Subtest
! scope="col" | Core?
! scope="col" | Description
! scope="col" | Proposed abilities measured
|-
! rowspan="4" | Verbal Comprehension
! scope="row" | Similarities
| {{ya}}
| Describe how two words or concepts are similar.
| Abstract verbal reasoning; semantic knowledge
|-
! scope="row" | Vocabulary
| {{ya}}
| Name objects in pictures or define words presented to them.
| Semantic knowledge; verbal comprehension and expression
|-
! scope="row" | Information
| {{ya}}
| General knowledge questions
| Degree of [[general knowledge|general information]] acquired from culture
|-
! scope="row" style="font-weight:normal" | Comprehension
| {{na}}
|Questions about social situations or common concepts.
| Ability to express abstract social conventions, rules and expressions
|-
! rowspan="5" | Perceptual Reasoning
! scope="row" | [[Block design test|Block Design]]
| {{ya}}
|Put together red-and-white blocks in a pattern according to a displayed model. This is timed, and some of the more difficult puzzles award bonuses for speed.
| Visual spatial processing and problem solving; visual motor construction
|-
! scope="row" | Matrix Reasoning
| {{ya}}
|View an array of pictures with one missing square, and select the picture that fits the array from five options.
| Nonverbal abstract problem solving, [[inductive reasoning]]
|-
! scope="row" | Visual Puzzles
| {{ya}}
|View a puzzle in a stimulus book and choose from among pieces of which three could construct the puzzle
| Visual spatial reasoning
|-
! scope="row" style="font-weight:normal" | Picture Completion
| {{na}}
|Select the missing part of a picture
| Ability to quickly perceive visual details
|-
! scope="row" style="font-weight:normal" | Figure Weights
| {{na}}
|View a stimulus book that pictures shapes on a scale (or scales) with one empty side and select the choice that keeps the scale balanced
| Quantitative reasoning
|-
! rowspan="3" | Working Memory
! scope="row" | Digit Span
| {{ya}}
| Listen to sequences of numbers orally and to repeat them as heard, in reverse order, and in ascending order.
| Working memory, attention, encoding, auditory processing
|-
! scope="row" | Arithmetic
| {{ya}}
|Orally administered arithmetic word problems. Timed.
| Quantitative reasoning, concentration, mental manipulation
|-
! scope="row" style="font-weight:normal" | Letter-Number Sequencing
| {{na}}
| Recall a series of numbers in increasing order and letters in alphabetical order.
| Working memory, attention, mental control
|-
! rowspan="3" | Processing Speed
! scope="row" | Symbol Search
| {{ya}}
|View rows of symbols and target symbols, and mark whether or not the target symbols appear in each row.
| Processing speed
|-
! scope="row" | Coding
| {{ya}}
|Transcribe a digit-symbol code using a key. The task is time-limited.
| Processing speed, associative memory, graphomotor speed
|-
! scope="row" style="font-weight:normal" | Cancellation
| {{na}}
|Scan arrangements of shapes and mark specific target shapes within a limited amount of time
| Processing speed
|}
===Standardization===
The WAIS-IV was standardized on a sample of 2,200 people in the United States, ranging in age from 16 to 90.<ref name="pearson-press">{{cite press release | title = Wechsler Adult Intelligence Scale, Fourth Edition Now Available From Pearson | publisher = Pearson | date = 28 August 2008 | url = http://www.pearsonassessments.com/haiweb/Cultures/en-US/Site/AboutUs/NewsReleases/NewsItem/NewsRelease082808.htm | access-date =2012-03-20}}</ref> The demographic characteristics of the sample were modeled after the proportions of different groups in an analysis of data from the [[United States Census Bureau|U.S. Census Bureau]]. An extension of the standardization has been conducted with 688 Canadians in the same age range.
==WAIS-5==
The fifth edition of the Wechsler Adult Intelligence Scale was released in late 2024. Normative data were collected in 2023–24 on a U.S. Census-reflective sample that was conormed on the Wechsler Memory Scale: Fifth Edition.
The WAIS-5 introduces several new subtests, particularly in the working memory domain, with Digit Span Sequencing and Running Digits now being the core subtests that compose the Working Memory Index. Digit Span Forward, Digit Span Backward, and Letter-Number Sequencing may also be used to construct the Expanded Working Memory Index.
The Perceptual Reasoning Index has been split into Visual Spatial Ability (Block Design, Visual Puzzles) and Fluid Reasoning (Matrix Reasoning, Figure Weights). A complementary Fluid Reasoning subtest Set Relations was also introduced, as well as an additional Processing Speed subtest Naming Speed Quantity, which was originally featured in the WISC-V.
The Full Scale Intelligence Quotient is now generated from only seven subtests (Similarities, Vocabulary, Block Design, Matrix Reasoning, Figure Weights, Digit Span Sequencing, Coding), similar to the WISC-V. Fifteen ancillary index scores, including the General Ability Index, are also present.
Administration is anticipated to be shorter than the WAIS-IV, especially for those who are suspected as being intellectually gifted. The test may be administered in the classic physical format or on a digital platform.<ref>{{cite web|title=WAIS-5 Overview Brochure|url=https://www.pearsonassessments.com/content/dam/school/global/clinical/us/assets/wais-5/wais-5-overview-brochure.pdf|access-date=18 April 2024|website=Pearson}}</ref>
==Age range and uses==
The WAIS-IV measure is acceptable for use with people who are 16–90 years of age. For people younger than 16, the [[Wechsler Preschool and Primary Scale of Intelligence]] (WPPSI, 2½–7 years, 7 months) and the [[Wechsler Intelligence Scale for Children]] (WISC, 6–16 years) are used.<ref name="mentalhelp">{{cite web |title=Psychological Testing: Wechsler Adult Intelligence Scale |url=https://www.mentalhelp.net/psychological-testing/wechsler-adult-intelligence-scale/ |website=mentalhelp.net |date=17 March 2019 |access-date=23 December 2020}}</ref>
Intelligence tests may be used to assess the level of cognitive functioning in individuals with psychiatric illness or brain injury. Rehabilitation psychologists and [[clinical neuropsychology|neuropsychologists]] use [[neuropsychological test]]s (including the WAIS-IV) to assess how the individual's brain is functioning after it has been injured.  Specific subtests can provide insight into specific cognitive functions; for example, the digit span subtest could be used to look for attentional difficulties.<ref name="mentalhelp" />
The Wechsler tests can also be used to identify [[intellectual giftedness]], and are commonly accepted as qualifying evidence for [[High-IQ society|high-IQ societies]], such as [[Mensa International|Mensa]], [[Intertel]] and the [[Triple Nine Society]].<ref>{{Cite web|title=Qualifying test scores|url=https://www.us.mensa.org/join/testscores/qualifying-test-scores/|access-date=2021-04-25|website=American Mensa|language=en}}</ref><ref>{{Cite web|title=Intertel – Join us|url=https://www.intertel-iq.org/join-us|access-date=2021-04-25|website=www.intertel-iq.org}}</ref><ref>{{Cite web|title=Test Scores|url=http://www.triplenine.org/HowtoJoin/TestScores.aspx|access-date=2021-04-25|website=www.triplenine.org}}</ref>
==WASI-II==
{{Redirect|WASI|the system interface for WebAssembly|Webassembly#WASI}}
The Wechsler Abbreviated Scale of Intelligence – 2nd edition (WASI-II) is a short psychological test that was developed in 2011 by Pearson to estimate intellectual functioning in a shorter period of time than the WAIS-IV.<ref>{{cite journal |author=Weschler |first=David |year=2011 |title=Review of the Wechsler Abbreviated Scale of Intelligence, Second Edition (WASI-II) |url=https://journals.sagepub.com/doi/abs/10.1177/0734282912467756 |journal=Journal of Psychoeducational Assessment |volume=31 |issue=3 |pages=337–341 |doi=10.1177/0734282912467756 |pmid= |s2cid=146832097}}</ref> The WASI-II only has 4 subtests: Block Design, Vocabulary, Similarities, and Matrix Reasoning, compared to the 10 core subtests that are present in the WAIS-IV. These 4 subtests have the same structure as the similarly-named subtests on the WAIS-IV, but have different questions.
The WASI-II can derive 4 composite scores from a combination of the 4 subtests.    A Verbal Comprehension Index (VCI) can be derived from the raw scores on the Vocabulary and Similarities subtests. A Perceptual Reasoning Index (PRI) can be derived from the raw scores on the Matrix Reasoning and Block Design subtests. A Full Scale IQ-2 (FSIQ-2) can be derived from the raw scores on the Matrix Reasoning and Vocabulary subtests, while a Full Scale IQ-4 (FSIQ-4) can be derived from the raw scores on all 4 subtests.
'''WASI-II Subtests grouped by index'''
{| class="wikitable"
|+
!Index
!Subtest
!Description
!Proposed abilities measured
|-
! rowspan="2" |Verbal Comprehension
|Similarities
|Describe how two words or concepts are similar.
|Abstract verbal reasoning; semantic knowledge
|-
|Vocabulary
|Name objects in pictures or define words presented to them.
|Semantic knowledge; verbal comprehension and expression
|-
! rowspan="2" |Perceptual Reasoning
|Block Design
|Put together red-and-white blocks in a pattern according to a displayed model. This is timed, and some of the more difficult puzzles award bonuses for speed.
|Visual spatial processing and problem solving; visual motor construction
|-
|Matrix Reasoning
|View an array of pictures with one missing square, and select the picture that fits the array from five options.
|Nonverbal abstract problem solving, [[inductive reasoning]]
|}
== See also ==
* [[Wechsler Intelligence Scale for Children]]
*[[Wechsler Preschool and Primary Scale of Intelligence]]
==References==
{{Reflist|30em}}
==Further reading==
*{{cite book |title=Wechsler's Measurement and Appraisal of Adult Intelligence |last=Matarazzo |first=Joseph D. |date=1972 |edition=5th and enlarged |publisher=Williams & Witkins |location=Baltimore}}
**{{cite journal |author=R. D. Savage |date=April 1974 |title=Wechsler's Measurement and Appraisal of Adult Intelligence, 5th ed |type= Review |journal=British Journal of Industrial Medicine |volume=31 |issue=2 |page=169 |pmc=1009574}}
*{{cite book |title=The Measurement of Adult Intelligence |last=Wechsler |first=David |author-link=David Wechsler |date=1939 |publisher=Williams & Witkins |location=Baltimore (MD) }}
*{{cite book |title=The Measurement and Appraisal of Adult Intelligence |last=Wechsler |first=David |author-link=David Wechsler |date=1958 |edition=4th |publisher=Williams & Witkins |location=Baltimore (MD) |url=https://archive.org/details/measurementandap001570mbp |access-date=4 June 2013 }}
* {{cite book |title=WAIS-IV Clinical Use and Interpretation: Scientist-Practitioner Perspectives |editor1-last=Weiss |editor1-first=Lawrence G. |editor2-last=Saklofske |editor2-first=Donald H. |editor3-last=Coalson |editor3-first=Diane |editor4-last=Raiford |editor4-first=Susan  |others=Alan S. Kaufman (Foreword) |date=2010 |publisher=Academic Press |location=Amsterdam |series=Practical Resources for the Mental Health Professional |isbn=978-0-12-375035-8}}
==External links==
* [http://www.apa.org/science/programs/testing/find-tests.aspx FAQ/Finding Information About Psychological Tests (American Psychological Association)]
* [http://psychclassics.yorku.ca/ Classics in the History of Psychology]
* [http://caitiq.com/ WAIS Estimator]
{{Psychologic and psychiatric evaluation and testing}}
{{Neuropsychology tests}}{{Authority control}}
[[Category:Intelligence tests]]
[[Category:Neuropsychological tests]]