I don’t know that there is a way. I know that some engineering meetings start with listing the core assumptions so that everyone has a baseline for the starting point.
But, I don’t think you ever get rid of it entirely.
As you state, my obvious answer may not have worked exactly, but at least mentioning it gave the idea an opportunity to be examined and considered. Ultimately, the final solution we executed differed in details from the initial suggestion; that’s OK, though, because we were able to take advantage of a channel that we previously hadn’t considered.
I don’t know that there’s a super-efficient way to make sure everyone is on the same page, and frankly I don’t even know if that is organizationally healthy. If you read some of the above responses, when everyone is on the same page and aligned about the assumption, it inherently closes off new perspectives. In that direction lies the death of innovation.
I think we constantly have to challenge our assumptions and knowledge. That’s when we see the most incredible scientific breakthroughs.