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In this paper we introduce the Comprehension SEEDING system and describe the system components designed to enhance classroom discussion by providing real-time formative feedback to teachers. Using SEEDING, teachers ask free-response questions. As students are constructing their responses using digital devices, SEEDING allows teachers to assess a student's understanding. Once SEEDING collects student responses, the system automatically groups them based on semantic similarity. Teachers can use this information to address student misconceptions and engage the classroom from a more informed perspective. This paper describes the SEEDING system and how it can be used to aid teachers and improve classroom discussion.© 2014 Springer International Publishing Switzerland.