How is the WIAT Test Scored? (2024)

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WIAT test scoring (Wechsler Individual Achievement Test-Third Edition) is based on several derivations of status scores and growth scores. They are as follows:

Status Scores

• Standard Score
• Percentile Rank
• Normal Curve Equivalent
• Stanines

Growth Scores

• Grade Equivalent
• Age Equivalent
• Growth Scale Values

For standard scores, each number given shows the level at which your child is performing.

Score Classification

130-above Very Superior

120-129 Superior

110-119 High Average

90-109 Average

80-89 Low

70-79 Borderline

69-below Extremely Low

The administrators then use these scores to interpret performance by noting and comparing the following, noting the pattern of strengths and weaknesses:

• Growth Scale Values
• Grade-Based and Age-Based Scores
• Composite Scores
• Score Differences
• Statistical Significance of Score Differences
  • Frequency of Score Differences
  • Qualitative Evaluation of Subtest Component Score Differences
    • Out-of-Level Item Set Performance

*Note: The WIAT is an achievement test that measures how an individual is doing in areas of academic work. It will give a summary of achievement and understanding in subjects like reading, math, written language, and oral language.

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