Giving feedback on free-text answers (in the form of grades or helpful hints) is a core educational task. Despite a large body of NLP research on the topic, assisting teachers with this task remains challenging. In this talk, we outline the linguistic and external factors influencing the performance level that NLP methods may reach for a given question. However, even in settings where automatic performance rivals humans, there are various practical requirements often overlooked in research that hinder adoption in the classroom and beyond.
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