The Questionnaire reflects the specific pathway of the user through the instrument - what questions were asked and in what order, what answers were provided. Without the Questionnaire, you can't see what questions were asked but skipped or what answer the user got to choose from The design is that the system behaves as a black box and doesn't necessarily persist previous submissions. While there's nothing to stop systems from choosing to persist what's been received (if legal conditions, etc. allow that to occur), we don't think clients should have to handle this complexity.  The Questionnaire isn't going to be that heavy - typically there aren't more than 10 or so questions asked before the user is 'done' the QuestionnaireResponse.