To think win-win is a mindset and a framework.
The opposite of the win-win mentality is the lose-win mentality. A person with lose-win mentality is someone who allows other people to take what they want, he or she becomes like a doormat and allow any person to walk all over them.
The lose-lose mentality is described as a person who thinks that if they are going to lose, then they want everyone around them to lose with them.
Thinking win-win is the best way to complete the mission and goals you set for yourself. When you think with a win-win mindset, it will help you to overcome roadblocks and any other kind of unforeseen issues that could possibly occur.