摘要：The aim of this study was to assess factors affecting the quality of paraphrases written by college level EFL learners. A three-dimensional paraphrasing competence model by McCarthy, Guess, and McNamara (2009) was followed to assess the texts for seman- tic completeness, lexical difference, and syntactic difference. The selected method was a mixed method approach. The quantitative analysis was used to measure the rate of success of each paraphrasing competence whereas the qualitative analysis aimed to de- scribe the perceived difficulty of the competences and the reasons behind it. The subjects were 17 EFL students enrolled in a third year English composition course at the Univer- sity of Costa Rica. The corpus of the study consisted of 51 paraphrases. Following three rounds of examinations and the analysis of students’ perceptions, the lexical dimension emerged as the most challenging area interfering with paraphrase quality, with seman- tic completeness also emerging as difficult. Other factors affecting paraphrase quality were inappropriate use of passive voice, style and register, and inaccurate lexical substi- tutions. The study concluded with recommendations to improve instructional cycles by reinforcing reading comprehension and lexical development, and by assessing the differ- ent dimensions of paraphrasing separately.
