Autonomous collaborative learning in English writing at university: Construction and evaluation of multilevel digital portfolios

英语写作的自我评价和同伴评价在网上进行，结果以多级数字档案袋的形式记录在新构建的WebDAV系统上，并引入MAHARA作为有效搜索和查看档案袋的系统。在对档案袋、时间序列变化和策略、协作元认知、自我效能感的描述中，采用文本挖掘和案例研究作为定性研究方法。本研究还通过问卷调查和Coh-Metrix项目对写作成绩的发展，定量考察了策略使用和自我效能感的提高，并结合定性研究阐明了多层次档案袋在支持大学写作自主协作学习中的有效性。

Self-evaluation and peer-evaluation of English writing were conducted online,and the results were recorded as multilevel digital portfolios on a newly constructed WebDAV system.MAHARA was also introduced as a system to search and view the portfolios effectively. In the descriptions of the portfolios, time-series changes and relationships in strategies, collaborative metacognition, self-efficacy were analyzed by employing text mining and case study as a qualitative research method. The study also quantitatively examined the improvement of strategy use and self-efficacy, based on questionnaires and the development of writing performance with the Coh-Metrix program.It finally elucidated the effectiveness of the multilevel portfolios in the support of autonomous collaborative learning of writing at university in conjunction with qualitative research.