Well a couple of things. I think the easiest answer, is a team that is looks at all sides of the M&A Deal. The finance team is usually a pretty good of over coming confirmation bias. They are the ones who are usually risk adverse and they are involved with budgets and understand the operations. The second one is a little bit of the obvious and a little bit challenging but understanding the confirmation bias and understanding the objections to the M&A Deal by looking at it from the other peoples view.
