Why is gathering multi-informant data often recommended in assessment?

Why is gathering multi-informant data often recommended in assessment?

• A. Because only the client can reliably report outcomes.
• B. Because multi-informants always agree and confirm results.
• C. Because different informants provide unique perspectives and can triangulate data, reducing bias.
• D. Because it eliminates measurement error.

Answer: (C)

Gathering information from multiple informants is valuable because behavior and functioning manifest differently across settings, and each observer notices different aspects of what’s happening. By collecting reports from diverse sources—clients, parents, teachers, clinicians—you can triangulate the data: look for patterns that appear across informants to support conclusions, and pay attention to discrepancies that reveal context, situational factors, or hidden issues needing further inquiry. This approach reduces reliance on a single perspective and helps counteract biases, memory gaps, or social desirability that can color any one report. It also broadens the view to include both observable behaviors and subjective experiences, which different informants may describe differently. It’s not that measurement error is completely eliminated, but the broader, corroborated picture increases the validity and usefulness of the assessment.