WIAT-III

Technical Information

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• Norming Sample: Total= 2,775
• Age groups: 4-19, split up into ranges 4-13, 14-16, 17-19
• Contained equal number of female and male students in each grade and age group.
• The proportions of students from each geographic region in the normative sample closely correspond to the proportions shown in the US population (Midwest, South, Northeast, and West.)
• Proportions of Whites, African Americans, Hispanics, Asians and other racial groups were also based on racial proportion of individuals within corresponding groups in the US population
• 7.9% of the fall sample and 7.6% of the spring sample contained students with diagnosed disabilities. (4% learning disability in reading, writing, or mathematics, 1.9% expressive language disorder, and 1% ADD/ADHD)
• Reliability and Validity

WIAT-III

• Intended age range: 4-0 to 19-11.

• Can be used in multiple educational, clinical, and research settings

• Assess Reading, Oral Language, Written Expression, & Mathematics

• Thirteen total subtest which comprise the six composite Scores that make up the total achievement index.

• Optional Composite: Math fluency

General Insights

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Composites

Basic Reading

(Grades 1-12)

Subtests:

• Word Reading: Word Reading Rate

• Pseudoword Decoding: Pseudoword Decoding Rate

Total Reading

(Grades 1-12)

Subtests:

• Reading Comprehension

• Word Reading: Early Reading Rate

• Pseudoword Decoding: Pseudoword Decoding Rate

• Oral Reading Fluency: Accuracy and Rate

Optional: Math Fluency

(Grades 1-12)

Strengths:

• oral discourse comprehension is presented from a CD recording rather than read aloud by the examiner
• easel format for presenting many subtest items
• protocol form is very detailed

Weaknesses:

• limited ceiling for some subtests
• not recommended for individuals with auditory problems
• hard to score by hand

Oral Language

(Grades PK-12)

Subtests: all one minute timed

• Addition
• Subtraction
• Multiplication (Grade 3 and Up)

Materials:

• Pencil (Without Eraser) and Stopwatch

Subtests:

• Listening Comprehension: Receptive Vocabulary, Oral Discourse Comprehension.

• Oral Expression: Expressive Vocabulary, Oral Word Fluency, Sentence Repetition.

Mathematics

(Grades K-12)

Subtests:

Math Problem Solving

• Assesses math reasoning skills in "real world" situations.

Numerical Operations

• Assesses ability to use numerical operations (from basic math to advanced algebra)

Written Expression

(Grades K-12)

Subtests:

Alphabet writing fluency (k-2)

• Assesses written expression ability. Given 30 seconds, student is to write all letters of the alphabet.

Sentence composition (1-12)

• Assesses written expression ability. Is made up of two parts, sentence combining and sentence building.

Essay Composition (3-12)

• Assesses written expression ability. Given 10 minutes, student is to write an essay on a single topic. Examiner scores based on word count, theme, and grammar and mechanics.

Spelling

• At an appropriate grade level, student is to spell words correctly.

Reading Comprehension and Fluency

Grades (K-12)

Subtests:

Reading Comprehension (Grade Appropriate)

• Student is given a passage to read and answer questions. Examiner gives a correct score for corresponding responses.

Oral Reading Fluency (Grade Appropriate)

• Student is to read a passage aloud. Examiner records reading time, additions, supplied words, substitutions/ omissions, transpositions, and prosody scale (how the student read)

The six main composites compose the total achievement composite.

Wechsler Individual Achievement Test: Third Edition

Brett E., Carly O., Kristin B., Nicole W., Shirin S., Anthony D.