Wechsler Individual Achievement Test - 3rd (WIAT-III A&NZ)

The WIAT-III is an individual assessment of academic achievement for students from the age of 4 till 50 years 11 months. The WIAT-III encompasses a broad range of academic skills such as Reading, Writing, Mathematics and Oral Language. It evaluates these various aspects of academic achievement by having the child engage in a variety of tasks.  These tasks are divided into three scales, the Reading Scale, Mathematics Scale and Written Language Scale. Results are reported as Percentile Ranks (PR) and broad descriptors. PR represents where a child scored in comparison to children of the same age group, eg, a PR=50 means a child performed better than 50 of 100 students of the same age. Percentile ranks between 25 and 75 are in the average range.

Subtests of WIAT-III include:

Basic Reading Word Reading

The examinee reads a set of single words out loud. This subtest measures the speed and accuracy of single word reading.

Pseudoword Decoding

The examinee reads out loud a set of single non-words. This subtest measures the speed and accuracy of decoding skills.

Maths Problem Solving

The examinee listens as the examiner reads each problem, looks at the corresponding visual stimuli, and provides oral and/or points to responses. This subtest measures maths problem-solving skills under untimed conditions.

Numerical Operations

The examinee is asked to complete the numerical operations by writing the answers in the provided response booklet. This subtest measures written mathematics calculation skills under untimed conditions.

Maths Fluency

The examinee completes as many problems as he/she can within a 60-second time limit. This subtest measures written mathematics calculation fluency (speed and accuracy).

Listening Comprehension

In the first component of listening comprehension, the examinee looks at a set of pictures, listens to a word spoken out loud by the examiner, and then points (or states the letter that corresponds to) the picture that best illustrates the meaning of the target word. In the second component, the examinee listens to an audio recording of one or more sentences of a narrative or expository information, listens to the question(s) read out loud by the examiner, and then orally answers the question(s). This subtest measures listening comprehension at the level of the word, sentence, and discourse.

Oral Expression

The examinee is evaluated on his/her skills in association with expressive vocabulary, oral word fluency, and sentence repetition. This subtest measures the skills and competencies that are important for effective oral expression and that underlie written language skills.

Reading Comprehension & Fluency Reading Comprehension

The examinee reads each passage out loud or silently, listens to each question asked out loud by the examiner, and orally answers each question with the passage available for reference. This subtest measures literal and inferential reading comprehension skills using a variety of passage and question types that resemble those used in school settings.

Oral Reading Fluency

The examinee reads a set of passages orally. This subtest measures oral reading fluency of expository and narrative passages.

Early Reading Skills

The examinee is presented auditory, visual, or combined auditory-visual stimuli and is required to respond either by pointing or orally. This subtest measures several skills deemed important for developing ready skills for students in years AU preschool-3 / NZ 0-4.

Alphabet Writing Fluency

The examinee writes alphabet letters within a 30-second time limit. This subtest measures the examinee's ability to write letters and can be administered to students in years AU preschool-3 / NZ 0-4.


The examinee listens to a target sound or word, listen to the sound or word within the context of a sentence, and then writes the sound or word. This subtest measures written spelling of single sounds and words from dictation.

Essay Composition Subtest

Students in years AU 3-12+ / NZ 4-13+ are given 10 minutes to write an essay on a specific subject. This subtest measures spontaneous, compositional skills, including theme development, text organisation, grammar, and mechanics.

Sentence Composition Subtest

Sentence Composition includes two subtasks: Sentence Combining requires students to combine two or more sentences into one well-written sentence that preserves the meaning of the original sentences, and Sentence Building requires students to write sentences that use target words with appropriate context. This subtest measures sentence formulation skills and written syntactic maturity and ability in students, years AU 3-12+ / NZ 4-13+. Quickly scored with easy access to word list.
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