What type of assessment involves examining a student's correctness on a reading benchmark?

The assessment that involves examining a student's correctness on a reading benchmark is best classified as a diagnostic assessment. This type of assessment is specifically designed to identify a student's current knowledge level and skills before instruction begins. By assessing students on reading benchmarks, educators can determine areas where students may struggle or excel, allowing for tailored instruction that meets individual needs.

In this context, the focus is on gathering detailed information about a student's abilities in reading, which can inform future teaching strategies. This form of assessment is crucial in establishing a baseline for each student, thereby guiding educators in designing targeted interventions or support.

Formative assessments, on the other hand, are conducted during the learning process to provide ongoing feedback that can improve student learning. Summative assessments evaluate student learning at the end of an instructional period, typically through standardized testing or major projects. Peer assessments involve students assessing one another's work, fostering collaborative learning but not focusing directly on measuring correctness against a benchmark. Thus, diagnostic assessment is the most appropriate choice for the question regarding examining correctness on a reading benchmark.