Decision engineering is a way of approaching a problem that helps you make smart decisions. It is like a set of tools that can help you understand the different choices you have and decide which one is best. It involves understanding the different elements of a problem, researching potential solutions, creating a plan, and then following through with the plan. You can think of it like building a machine or a complex tool. You figure out all the parts, how they fit together, and how they can be used to create something that will work for you.