Which practice helps ensure reliable and valid interpretations in a diagnostic report?

• A. Use multiple sources of data and check for consistency across measures.
• B. Rely on a single test score
• C. Ignore SEM
• D. Omit discussion of limitations

Answer: (A)

Using multiple data sources and checking consistency across measures helps ensure interpretations in a diagnostic report are reliable and valid. No single test can capture all facets of a student’s abilities, and each instrument carries its own measurement error and potential biases. When information from standardized tests, curriculum-based assessments, observations, and teacher or parent reports converges on the same pattern, you gain stronger evidence that the findings reflect the student’s true abilities rather than random error or a test’s idiosyncrasies. This triangulation supports a more accurate understanding of strengths, weaknesses, and the appropriate supports or interventions.

If results diverge, it signals the need for deeper analysis—considering measurement error (SEM), the test’s coverage, and additional data to clarify the student’s profile. Relying on a single score ignores measurement error and can lead to misguided conclusions, while omitting discussion of limitations reduces transparency and trust in the report.