On Likert scale questions, all six students rated QSim as either “enormously useful” or “quite useful” as a learning tool. When asked whether QSim improved their confidence in their understanding of specific concepts such as the Heisenberg uncertainty principle most students selected either “a little” or “significantly”, with occasional selections of “a lot” and of “not at all”. The overall impression from the surveys was that students felt they had learnt things, but that they weren’t quite sure what. This is encouraging, as these students had already done two courses in quantum mechanics, while the target students are introductory level.