If you are a tenderer, you use state-owned funds and follow laws and regulations. If you want to achieve your goal, there are many routines to play. Simply choose a bidder, which is fair enough, and then choose the old formula that has been circulating for 5000 years, and draw lots for reasonable pricing review.
If you are a bidder, there are many problems. First, you have to communicate with the owner. At least, think about it Your father-in-law married his own daughter and didn't know this son-in-law. It's a bit unreasonable! Secondly, practice your internal skills, and your bidding documents will be compiled in strict accordance with the bidding documents! Third, just like business negotiation, you should show genuine sincerity.