What does triangulation of assessment data mean in this context?

• A. Using data from a single source only.
• B. Collecting data at two points in time.
• C. Using multiple kinds of data over time to inform instruction.
• D. Relying on observation notes from one day.

Answer: (C)

Triangulation means gathering evidence from different kinds of data and looking at how that evidence appears over time, so you get a fuller, more accurate picture of a student’s learning. In practice, you’d combine multiple sources—such as running records, miscue analysis, vocabulary or comprehension checks, student work samples, and classroom observations—collected across several days or weeks. This helps you confirm patterns and avoid overemphasizing a single score or moment, then use what you learn to tailor instruction.

That’s why the best choice is the one that emphasizes using multiple kinds of data over time to inform instruction. Relying on a single data source, or collecting data at only two points, or basing decisions on notes from one day alone would not provide the comprehensive view triangulation aims for.