The Stanford Diagnostic Reading Test is an example of which test type?

• A. Achievement Test
• B. Aptitude Test
• C. Personality Test
• D. Diagnostic Test

Answer: (D)

The test type being evaluated is diagnostic assessments, which are used to identify specific strengths and weaknesses to guide targeted intervention. The Stanford Diagnostic Reading Test fits this purpose because it is designed to pinpoint particular reading skills a student may struggle with—such as decoding, fluency, or comprehension—and provide detailed information that can inform individualized instruction. It’s not primarily about measuring how much a student has learned overall after instruction (that would be an achievement test), nor about predicting future learning potential (aptitude), nor about personality traits. Instead, it focuses on diagnosing specific reading difficulties so remediation can be tailored.