"I would create a table comparing the cost evaluation from each bid. In my experience, the highest bidder is usually a firm that has built its own contingency plans and included them in the budget. So, if I find this to be the case, then I will put it front and center. In my experience, the low bidders don't account for unforeseen costs. I would also show items from my top firm's portfolio and feature ones that are similar to our project. In short, I won't directly persuade them my way, but I will present them with enough information to make them feel good about their decision."