The effect of vocabulary size in oral productions on the speaking proficiency of EFL learners
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Abstract
This s tudy inves tiga tes the effect of using a bigger vocabulary size in oral class room presenta tions on the speaking profi ciency
of students in English as a foreign language . The s tudy was conducted with 30 freshman s tudents doing their lis tening and
speaking course in Semnan Uni versi ty. For the enti re course of 12 weeks , the s tudents in the experimental group were asked
to present their productions in terms of the vocabulary they employed, whi ch was also the focus of the teacher’s evalua tion
in each session. At the end of the course , they were interviewed for their profi ciency in speaking. The descripti ve and
inferential calculations were done based on a modi fied version of an oral profi ciency i nterview scale sugges ted by Penny Ur.
The answers were recorded and their fluency and accuracy were graded. The resul ts sugges t tha t s tudents wi th a vocabularyri
ch producti on improved their speaking profi ciency in English more than other students did.
Keywords: Vocabulary size , speaking profi ciency, production, fl uency, accuracy, interview.
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