网上作业允许多次尝试效果的实证研究
An Empirical Study of the Effect of Granting Multiple Tries for Online Homework
摘要：
在物理课程中部署在线作业时，一个重要的考虑因素是应该允许多少次尝试来解决数值自由响应问题。一方面，尝试的最大数量应该足够大，以允许学习者掌握概念并抑制复制，另一方面，太多的允许尝试会鼓励适得其反的问题解决行为。在一项针对科学家和工程师的微积分基础物理入门课程的研究中，研究人员发现，除了最初的尝试之外，学生们并没有有效地利用后来的尝试，事实上，允许尝试的次数越多，家庭作业完成的成功率就越低。
英文摘要：
When deploying online homework in physics courses, an important consideration is how many attempts should be allowed in order to solve numerical free-response problems. While on the one hand, the maximum number of attempts should be large enough to allow learners mastery of the concepts and disincentivize copying, on the other hand, too many allowed attempts encourage counter-productive problem-solving behavior. In a study of an introductory calculus-based physics course for scientists and engineers which had different numbers of allowed attempts in different semesters, it was found that except for the initial tries, students are not making productive use of later attempts, and that in fact higher numbers of allowed attempts lead to less successful homework completion.
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