The rhetorical argument that laboratory courses are crucial for training skilled STEM practitioners is ill-evidenced in teaching practice. The arduous task of implementing instructor-led skill assessment in large-cohort courses and persistent student disengagement from its educative goals are some obstacles. This study emphasized the need to equip learners to self-assess technical skills, supported by explicit performance standards and objective evidence. It trials two interventions, a self-assessment (SA) checklist and a learner-recorded video, to examine how the combination impacts the appraisal ability and attitudes towards SA. The participants were from a first year chemistry course in a biotechnology and chemical engineering course. All the participants self-assessed titration competencies against a checklist, with about half assisted with a video replay. A video critique task showed a significant main effect by intervention. SA-with-video participants scored higher than SA-only participants and the control group. The additional video intervention did not produce any significant gains above SA alone. Qualitative analysis revealed that SA-with-video participants were more targeted in their critique responses. Video differences in attitudinal responses towards SA were not prominent. Selected SA items related to perceptions of the value of SA in skill improvement, and, as a future study strategy, goals and commitment of using SA for skill improvement, were associated with video exposure in the biotechnology course, or with the course in the video group. Improvements for future work are discussed.

中文翻译：

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通过视频回放增强形成性和自我评估，以提高滴定实验室的批判技巧

关于实验室课程对于培训STEM熟练从业者至关重要的夸夸其谈的论据在教学实践中是没有根据的。在大班课程中实施导师指导的技能评估和持续的学生脱离接触的艰巨任务从其教育目标出发，存在一些障碍。这项研究强调了在明确的绩效标准和客观证据的支持下，使学习者能够自我评估技术技能的必要性。它试用了两种干预措施，即自我评估（SA）清单和一个由学生录制的视频，以检查该组合如何影响对SA的评估能力和态度。参加者来自生物技术和化学工程课程的第一年化学课程。所有参与者都根据清单对自己的滴定能力进行了自我评估，其中约有一半的人可以进行视频重播。一项视频评论任务通过干预显示出重要的主要效果。带有视频的SA参与者的得分高于仅带有SA的参与者和对照组。额外的视频干预并没有比SA本身带来任何明显的收益。定性分析表明，带视频的SA参与者在批评评论中更具针对性。对SA的态度反应的视频差异并不明显。选定的SA项目与对SA在技能改进中的价值的认识有关，并且作为未来的学习策略，使用SA进行技能改进的目标和承诺与生物技术课程中的视频曝光或视频课程相关。团体。讨论了未来工作的改进。与生物技术课程或视频课程中的视频曝光相关。讨论了未来工作的改进。与生物技术课程或视频课程中的视频曝光相关。讨论了未来工作的改进。