Which statement correctly describes the difference between formative and diagnostic assessment?

Which statement correctly describes the difference between formative and diagnostic assessment?

• A. Formative focuses on final outcomes.
• B. Diagnostic informs ongoing instruction.
• C. Formative informs ongoing instruction; diagnostic identifies specific gaps before or during instruction.
• D. Diagnostics is the same as formative assessment.

Answer: (C)

Formative assessment is used during learning to check progress and guide instruction in real time. It provides ongoing feedback that helps both teacher and student know what to address next, so teaching can be adjusted while students are still working toward understanding. Diagnostic assessment, by contrast, is used to uncover specific gaps or missing prerequisites before or at the start of instruction, so you can plan targeted support tailored to those needs. So the best description is that formative informs ongoing instruction, while diagnostic identifies specific gaps before or during instruction. This distinction matters because it shows how each type serves a different role: formative helps you adapt teaching as learning happens, and diagnostic helps you design targeted interventions from the outset based on identified gaps. For example, a quick check after a lesson is formative, while a pretest at the beginning of a unit is diagnostic.

Formative assessment is used during learning to check progress and guide instruction in real time. It provides ongoing feedback that helps both teacher and student know what to address next, so teaching can be adjusted while students are still working toward understanding. Diagnostic assessment, by contrast, is used to uncover specific gaps or missing prerequisites before or at the start of instruction, so you can plan targeted support tailored to those needs.

So the best description is that formative informs ongoing instruction, while diagnostic identifies specific gaps before or during instruction. This distinction matters because it shows how each type serves a different role: formative helps you adapt teaching as learning happens, and diagnostic helps you design targeted interventions from the outset based on identified gaps. For example, a quick check after a lesson is formative, while a pretest at the beginning of a unit is diagnostic.