Feedback and corrections should happen frequently to keep students on track, improve their work, and set them up for success in the final product. Waiting too long to give feedback may result in work that is too far gone to be fixed or improved.
Hernandez, M. (2016, June 6). Evaluation Within Project-Based Learning. Retrieved April 2, 2020, from Edutopia website: https://www.edutopia.org/blog/evaluating-pbl-michael-hernandez