The four-sides model is a way of looking at relationships between people. It's like a square with four sides. Each side of the square represents how two people interact with each other. For example, Person A and Person B might have different ideas about how to do a task. The four sides are how each person feels about the other person's opinion, which is either positive (agreeing) or negative (disagreeing). So one side might be "Person A agrees with Person B's idea", another side might be "Person A disagrees with Person B's idea", and the other two sides might show how Person B feels about Person A's opinion. So the four-sides model shows how people work together and get along, and suggests ways to build better relationships.