Builders run into problems. If there’s anything a product team should be good at, it’s solving them! But most of us rarely spend time sharpening our problem-solving saw. Enter the concept of mental models. Models give us abstractions of how one or more things actually work. They help us understand the world. George MacGill provides this analogy: If your consciousness is the operating system, mental models are like apps, which you can use to help make decisions in whatever situations you find yourself in.