Mapping the spoken vocabulary knowledge of second language (L2) learners of English

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In the current study, we explore potential relationships between lexical diversity (with different text lengths and analysis units), utterance fluency, and general speaking proficiency. We aim to report on an investigation of approximately 105 participants from a UK university divided into three different IELTS proficiency levels. We explore a corpus of participant undergraduate presentations. We investigate and compare flemma, lemma, and simple count influences on LD measure speaking predictability, using three basic LD measures and three sophisticated measures. Following earlier research (Treffers-Daller 2013), we also examine different text lengths.