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This article reports on research into the quality of critical thinking factors in research articles of Iranian researchers in library and information science (LIS) over a period of 10 years (1997-2007). The research method includes content analysis, a checklist built on Facion's critical thinking factors, and the international test of Paul and Elder. The collected data are analyzed by using descriptive, analytical, and deductive methods. The research population includes 138 research articles examined based on systematic stratified random sampling selected out of 521 articles. The findings indicate that the presence of critical thinking factors in researched articles was higher than average (mean=2.97) and there was a significant difference between authors' gender and these factors in favor of females (mean for females=80.29 ; mean for males=62.57). There was not significant difference between authors' education level and these elements.