What is Item analysis and how does it help teachers understand test item quality

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What is Item analysis and how does it help teachers understand test item quality?  How is test item quality determined by calculating “item difficulty” as well as “item discrimination”? How is this information used to improve teacher-made assessments?

Required Reading:

Musial, D., Nieminen, G., Thomas, J., & Burke, K. (2008). Foundations of meaningful educational assessment. Boston: McGraw Hill.

Additional Files:

chapter11-readings.docx