Rather than focusing on why someone's suggestion will not work, ask them what is necessary or required for their idea to work. Let them own the question and learn how to find a solution that fits their proposal.

It's more productive to focus on finding the right solution rather than proving someone wrong. In a well-functioning team, mutual respect is key, and it matters little who is right or wrong as long as we're all honestly seeking a viable solution.

If someone proposes a solution, clarify the path to success. Go, go, go.