在大规模开放在线课程中,交错与一次性内容发布:评估一个自然实验

Tommy Mullaney, J. Reich
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引用次数: 18

摘要

我们报告了一项实验,测试在大规模开放在线课程(MOOC)启动时发布所有内容与在错开发布中发布所有内容的效果。2013年,HarvardX开设了两次HeroesX课程:第一次是在四个月内每周发布一次内容;在第二种情况下,所有内容都是一次性发布的。我们开发了三种“跟踪性”的操作化方法来衡量学生如何与推荐的教学大纲同步参与。两个版本的追踪度都很低,但在第二个版本中,平均追踪度大约是第一个HeroesX关卡的一半。我们发现两种跑步在坚持、参与和完成度上几乎没有区别。控制学生的活跃周数,我们估计跟踪对认证的适度积极影响。学生们对灵活性的偏好以及在线学习的最小好处表明,对MOOC设计师来说,一次发布所有内容可能是一个可行的策略。
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Staggered Versus All-At-Once Content Release in Massive Open Online Courses: Evaluating a Natural Experiment
We report on an experiment testing the effects of releasing all of the content in a Massive Open Online Course (MOOC) at launch versus in a staggered release. In 2013, HarvardX offered two "runs" of the HeroesX course: In the first, content was released weekly over four months; in the second, all content was released at once. We develop three operationalizations of "ontrackness" to measure how students participated in sync with the recommended syllabus. Ontrackness in both versions was low, though in the second, mean ontrackness was approximately one-half of levels in the first HeroesX. We find few differences in persistence, participation, and completion between the two runs. Controlling for a students' number of active weeks, we estimate modest positive effects of ontrackness on certification. The revealed preferences of students for flexibility and the minimal benefits of ontrackness suggest that releasing content all at once may be a viable strategy for MOOC designers.
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