| Summary: | 碩士 === 臺北市立教育大學 === 英語教學系碩士班 === 101 === The present study aims to investigate the relationship between English speaking performance (ESP) and three vocabulary components, including productive vocabulary size, lexical collocational knowledge, and idiomatic knowledge. Specifically, the study intends to answer the following three research questions: (1) What is the relationship between productive vocabulary size and ESP? (2) What is the relationship between lexical collocational knowledge and ESP? (3) What is the relationship between idiomatic knowledge and ESP? A total of 32 English-majored graduate students participated in the study. This study employed six types of instruments: (1) one background questionnaire, (2) one productive vocabulary levels test, measuring the participants’ productive vocabulary size, (3) one lexical collocation test, assessing their lexical collocational knowledge, (4) one idiom test, gauging their idiomatic knowledge, and (5) two speaking tests, measuring their oral performance. The collected data were computed and analyzed through the Descriptive Statistics, the split-half reliability and the Pearson correlation procedures. The results showed that: (1) productive vocabulary size was significantly and moderately related (r = .55, p < .01) to ESP, (2) no significant correlation (r = .13, p > .05) was found between lexical collocational knowledge and ESP, and (3) significant correlation coefficient (r = .54, p < .01) was obtained between idiomatic knowledge and ESP. Based on these findings, some pedagogical implications and suggestions for future research were provided.
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