Features measuring vocabulary and grammar

Su Youn Yoon, Xiaofei Lu, Klaus Zechner

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Scopus citations


A system for scoring spontaneous speech is expected to assess global oral proficiency, which is widely regarded to be multi-componential. In the context of second language (L2) speaking, grammar, and vocabulary skills have been considered to be two core dimensions that strongly influence L2 learners’ oral proficiency, along with fluency and pronunciation. Not surprisingly, the strong impact of grammar and vocabulary on L2 proficiency has led to a growing interest in the development of quantitative features that can estimate the developmental level of L2 grammar and vocabulary skills. During the feature development stage, researcher considerations included the construct relevance of the features, feasibility of implementing the automated feature extraction process, and the features’ strength of association with oral proficiency scores. The automated assessment of lexical or grammatical accuracy from spontaneous speech requires very high accuracy in the automated speech recognition system, as well as multiple automated sub-processes such as syntactic parsing and automated error detection.

Original languageEnglish (US)
Title of host publicationAutomated Speaking Assessment
Subtitle of host publicationUsing Language Technologies to Score Spontaneous Speech
PublisherTaylor and Francis
Number of pages15
ISBN (Electronic)9781351676113
ISBN (Print)9781315165103
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • General Arts and Humanities
  • General Social Sciences
  • General Engineering


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