In this study, university English as a Second Language (ESL) learners' responses to 5 different types of text-based vocabulary exercises were examined. The objective was to understand better how such exercises may promote different kinds of lexical processing and learning and to compare these outcomes with those from thematic reading for comprehension. The results support a view of vocabulary acquisition as an elaborative and iterative process and demonstrate the primary role of the tasks learners carry out with new words that they encounter. Tasks provide learners with varied and multiple encounters with given words that highlight different lexical features, promoting elaboration and strengthening of different aspects of word knowledge. The findings also provide insight into the nature of the advantages, found in previous research, of using text-based vocabulary exercises together with a reading text as opposed to using multiple reading texts for the learning of particular words and their lexical features.THIS STUDY, A FOLLOW-UP TO AN EARLIER experiment, analysed university English as a Second Language (ESL) learners' introspective reflections while they were carrying out different kinds of vocabulary learning exercises drawn from a written text. 1 Its purpose was to explore how the exercises might promote vocabulary growth. The study was prompted by our interest in examining how reading practice interacts with vocabulary development and in explaining the outcomes of an earlier experiment in which reading, combined with text-based vocabulary exercises, led to gains in second language (L2) vocabulary knowledge that were superior to those obtained from a reading for comprehension condition involving multiple texts and equal instructional time . The text and the exercises used in this study were the same as those used in the earlier experiment, and the student participants were similar to the earlier participants in English proficiency, age, academic background, and variability of the first language (L1). The exercises represented a five-part classification based on the nature of the language task and its emphasis on given aspects of word knowledge . The focus of this research is on how learners responded to different vocabulary tasks-particularly with respect to the target words and their features. A better understanding of how given tasks may promote different kinds of lexical learning and of how learners deal with unfamiliar words while reading (Paribakht & Wesche, 1999) may, together, help explain the different vocabulary learning outcomes of the two conditions in the earlier experiment and lead to useful insights for vocabulary instruction.
READING AND VOCABULARY DEVELOPMENTResearchers in both L1 and L2 acquisition have studied the role of reading in the acquisition of vocabulary knowledge. In vocabulary acquisition