The aim of the present study was to investigate the effects of two types of paragraph on EFL learners’ written production. It addressed the issue of how three aspects of language production (i.e. complexity, accuracy, and fluency) vary among two types of paragraphs (i.e. paragraphs of chronology and cause-effect) written by EFL learners. Thirty intermediate level learners of English participated in the study. Each learner wrote the two specified types of paragraphs in the final exam of their writing course. In the first phase of the study, separate paired t-tests were conducted on each dependent variable to see whether there were any statistically significant differences in measures of complexity, accuracy, and fluency across the paragraph types. In the second phase of the study, to investigate if the raters detect the inconsistencies in the complexity, accuracy, and fluency of paragraphs written by a learner, four raters were asked to rate 12 paragraphs written by six learners whose paragraphs differed extremely in one of the three features. The findings revealed that EFL learners performed significantly better in paragraphs of chronology than the paragraphs of cause-effect in terms of fluency and accuracy. However, the analysis of complexity measures showed that there was no significant difference between the two types of paragraphs. In the qualitative analysis, it was found that raters did not consistently consider these three features in their examining the quality of the paragraphs. They paid attention to qualities such as coherence, cohesion and unity more consistently.
