基于群体感知的在线同伴互评系统实现与应用

The Online Group Awareness-Supported Peer Assessment System and Its Application

在线同伴互评作为协作学习的一种方式,注重对学习者学习过程的评价,有助于提高学习者的批判性思考能力,提升学习动机,增强社会存在感,被认为能有效应对MOOC环境下大规模学习测评的需求。但在线同伴互评信效度不足、缺少反馈、交互行为弱的问题成为制约其深入发展的瓶颈。群体感知技术的发展为解决这一问题提供了新的技术手段和方法指导。基于群体感知的在线同伴互评系统,旨在通过融合同伴评价反馈机制,提供可视化群体感知模型,构建一种促进学习者认知发展的在线形成性同伴互评协作学习环境,使学习者更积极地参与同伴互评活动,并在与同伴交流、评价、反馈中,共享资源,建构知识。该系统突出了两大优势,一是对用户实现可视化反馈,二是采用独具特色的过程性评价模式。该系统经实验检验表明:大部分学生认为该系统可操作性较强,有助于提高感知能力,促进协作学习中的交互行为;同时在同伴互评中,认知维度的评语类型,尤其是直接修正类别的评语更有助于学习者对作业进行修改。

The online peer assessment,as a learning method of collaborative learning,pays attention to the evaluation of learners’ learning process,which helps to improve learners’ critical thinking ability,learning motivation and sense of social existence.It is considered to be an effective way to meet the needs of large-scale learning assessment in MOOC environment.However,the short of reliability and validity,lack of feedback and weak interaction behavior of online peer assessment have become the bottleneck restricting its further development.The maturity of group awareness technology provides new technical means and methodological guidance for solving this problem.The online peer assessment system based on group awareness,aims to set up a collaborative learning environment of online formative peer assessment by integrating peer assessment feedback mechanism and presenting visual group awareness model to promote learners’ cognitive development,thus learners can be more active and deeply involved in peer assessment,and share resources and construct knowledge in peer exchange,evaluation and feedback.This system highlights two major advantages.One is to achieve visual feedback to users,and the other is to adopt a unique process evaluation model.The experimental results have shown that most learners consider that this system can enhance the awareness ability of learners in the process of peer assessment and promote the interactive behavior in collaborative learning.And at the same time,the types of comments in cognitive dimension,especially those comments of direct correction type,are more helpful for learners to modify their homework in peer assessment.