Item Response Theory (IRT) has the advantage over Classical Test Theory in that it provides more detailed information regarding each item in a test.

Item Response Theory (IRT) is a modern psychometric theory that provides more detailed information about each test item (question) than Classical Test Theory (CTT). It uses item parameters such as item difficulty, discrimination, and guessing to determine how well each item measures the construct being assessed. CTT, on the other hand, only provides information about the overall reliability and validity of the test as a whole.