Document Type : Original Research Paper


Civil Engineering, Khajeh Nasir al-Din Tusi University,Tehran,Iran


In this paper with using the three- parameter logistic function in response to 4  choice items, the range of ability of each participant for each item or each exam is measured by Item response theory (IRT) and is marked and ranked by each participant’s ability. We will compare (IRT) with traditional ways of marking and ranking, with fitting tests. For this purpose we used IRT and many softwares that we created ourselves for marking one of the exams of the Educational Assessment of Iran ( and finding each participant’s ranking.


Main Subjects