Which theory posits that test item responses are influenced by the test taker and the test?

• A. Item Response Theory (IRT)
• B. Angoff Method
• C. Ebel Method
• D. Compensatory Grading

Answer: (A)

Item Response Theory models how likely a test-taker with a given ability will answer an item correctly, based on the item's properties. In this view, the probability of a correct response comes from an interaction between the person and the item, not from the test alone. Item parameters describe this interaction: difficulty (how hard the item is), discrimination (how sharply the item separates people of different ability levels), and sometimes guessing (the chance of getting it right by luck). The result is an item characteristic curve that shows how the likelihood of a correct answer changes as ability increases, and it allows calibrating items so that ability estimates are comparable across tests. Other approaches like standard-setting methods rely on judges’ estimates of passing performance rather than modeling responses with latent traits, and compensatory grading is about how different parts of a score combine, not about the theory of item responses.