Peter Hollins’s book is a collection of mental models that will teach you to make decisions quickly and confidently, connect logic, and find effective tools for a specific task. Each of us has many mental models: life values, experience, a unique worldview. We observe, analyze, compare, and copy. Many know how to behave at a table or in public places—and do it automatically. So why not learn even more mental models that will help us think critically, so we stay in demand in this complex and ever-changing world?