Depth and Breadth of Vocabulary Knowledge as Predictors of Narrative, Descriptive and Argumentative Writing

Among intriguing areas in vocabulary acquisition research are such variables as breadth and depth of vocabulary knowledge, and their predictability in writing performance. In this spirit, this study set out to determine how receptive breadth, productive breadth, and receptive depth of word knowledge, using word families, predict total writing task score and the vocabulary component of EFL learners’ narrative, descriptive, and argumentative writing performance. To this end, by administering Oxford Quick Placement Test to the learners enrolled in an advanced writing course, 70 (49 males, 21 females) EFL upper intermediate learners were selected as the participants of the study. To determine the participants’ receptive depth, and productive and receptive breadth of the word knowledge, the Word Associates Test, the Lex30, and the Vocabulary Size Test were administered to the participants respectively. The participants also undertook descriptive, narrative and argumentative writing tasks. The results of the correlation coefficients and regression analyses of the data specified that: a) receptive vocabulary breadth and depth significantly contributed to both overall writing and vocabulary component of narrative, descriptive and argumentative writing; b) The breadth of productive vocabulary knowledge measured by the Lex30 only correlated with the vocabulary component score as well as the total score of narrative, descriptive, and argumentative writing. The implications include the fact that lexical knowledge aspects can be systematically used in both developing syllabus materials and classroom teaching methodologies.