二语习得中的CAF测量：现状与趋势

复杂度、准确度和流利度（简称CAF）是应用语言学研究中的三个变量.文章首先探讨了CAF测量的两个维度：语言发展指标和任务表现指标.尽管这两个维度的CAF测量研究取得了一定的成果,但依然存在诸多问题和挑战.在此基础上,探讨了该领域未来发展的四个趋势：一是CAF测量应用范围深入拓展;二是测量数据向历时纵向数据转变;三是CAF测量普及性探索;四是自然语言处理工具的开发与广泛运用.

Assessment of CAF in Second Language Acquisition: Status Quo and Trends

Complexity, accuracy and fluency （CAF） are three variables in applied linguistics. This paper explores two dimensions for CAF assessment, namely, indicators of linguistic development and task performance. Despite some achievements in CAF assessment in these two dimensions, a number of problems and challenges exist. It is argued that there are four trends for the future development of this area. First, CAF assessment should be expanded in application. Second, assessment data will turn diachronically. Third, CAF assessment will be popularized. Fourth, natural language widely applied. processing tools should be developed and