Using demos feedback to improve curriculum

I'm creating an issue for this suggestion raised by @BenjaminSchwessinger on TopicBox. Common errors made by trainees during checkout should be used as feedback to strengthen our curriculum, but we do not currently have any means of systematically collecting these data.

Start by reviewing the suggestion raised on TopicBox and clarifying which checkout errors and curriculum areas are in scope. Define how feedback would be collected systematically and how it would inform curriculum changes; done means the collection and feedback approach is agreed and documented.

Written by the indexing model from the issue text.