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What is AS-Unit

Recent Tools for Computer- and Mobile-Assisted Foreign Language Learning
The abbreviation for an Analysis of Speech Unit. It is roughly equivalent to a sentence except that a not very sentence-like utterance such as “Good morning” or “Thank you” qualifies as one.
Published in Chapter:
Examining Oral Performance Characteristics of L2 Learners With the CAF Calculator
Kazumi Matsumoto (Ball State University, USA), Maki Hirotani (Rose-Hulman Institute of Technology, USA), and Atsushi Fukada (Purdue University, USA)
DOI: 10.4018/978-1-7998-1097-1.ch006
Previous fluency studies typically used small datasets to analyze L2 learners' oral performance with objective fluency measures, and found positive correlation between objective measures and subjective ratings. Findings from a small dataset are difficult to generalize. However, it takes a great deal of time and effort to build a large dataset with various measures. To help facilitate this process, CAF Calculator, which outputs 50 fluency measures, has been developed. In this chapter, CAF Calculator and a workflow to compute fluency measures are introduced along with a study investigating utterance fluency of L2 learners of Japanese at two proficiency levels performing two tasks. The study found significant differences in speed, breakdown, and composite fluency measures between the two groups in both tasks. It also found that task type affects pause locations. It is hoped that the research tools introduced in this chapter will encourage more research on fluency.
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