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Evidence suggests that variability in the ratings of students’ essays results not only from their differences in their writing ability, but also from certain extraneous sources. In other words, the outcome of the rating of essays can be biased by factors which relate to the rater, task, and situation, or an interaction of all or any of these factors which make the inferences and decisions made about students’ writing ability undependable. The purpose of this study, therefore, was to examine the issue of variability in rater judgments as a source of measurement error this was done in relation to EFL learners’ essay writing assessment. Thirty two Iranian sophomore students majoring in English language participated in this study. The learners’ narrative essays were rated by six different raters and the results were analyzed using many-facet Rasch measurement as implemented in the computer program FACETS. The findings suggest that there are significant differences among raters concerning their harshness as well as several cases of bias due to the rater-examinee interaction. This study provides a valuable understanding of how effective and reliable rating can be realized, and how the fairness and accuracy of subjective performance can be assessed. 

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While the previous studies showed the impact of the music on the words’ learning and retention, this study explores the effect of traditional music as an input mode on Iranian upper intermediate learners’ learning and retention of difficult English words. Eighty participants were divided into four groups. Two groups were exposed to western music while other two groups were exposed to Iranian traditional music. Each group received a pretest first, followed by instruction on selected difficult vocabulary items, and then posttest and delayed posttest. Repeated measures ANOVA indicated significant main impacts of time on vocabulary learning and retention. Descriptive statistics showed that those who were exposed to western music were outperformed by the ones who were exposed to Iranian traditional music in both immediate and delayed tests, although no significant interaction between time and music type was found. These results show that culturally familiar musical input may ease vocabulary learning and retention in L2 contexts. For language teaching and curriculum design implications are discussed.