Participants in both a small usability pilot and an expert appraisal survey rated and commented on the model.
Hans G. K. Hummel 2006, 'Feedback Model to Support Designers of Blended Learning Courses', International Review of Research in Open and Distance Learninghttp://www.irrodl.org/index.php/irrodl/article/view/379/748. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)