Most of the design reviews I’ve witnessed were mostly informal during project meetings. From what I’ve seen, initial designs are subject to many changes throughout the course of a project. The reasons for such changes often occur to minimize testing costs, lower material consumption, and of course to pass the testing phases if the original design fails to meet standards. I find it very important and logical to have design reviews very often and even informally because failure to discuss every small concern during smaller meetings may lead to complications in the future. However, I also find it equally important to involve everyone on the team when any changes are made so that everyone is aligned and can agree on the changes, as well as be aware of them for their own reference as they continue their role.