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The Item Discrimination Index (D) measures the extent to which an item:

A) Differentiates between high-achievers and low-achievers.
B) Has correct grammar and clear wording.
C) Is easy or difficult for students.
D) Is related to the learning objectives.

Correct Answer: A) Differentiates between high-achievers and low-achievers.

A high positive D-value means more high-achievers than low-achievers got the item right (good item). A negative D-value means more low-achievers than high-achievers got it right (flawed item).

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