Event tree analysis is a way of breaking down a big problem into smaller parts to help figure out what could happen as a result. It starts with a single event. Then, it looks at all the possible outcomes that could come from that first event. It's a bit like branching, like when you draw a tree with all the branches coming off it. Each branch is a different outcome that could happen as a result of the first event. By looking at all the possible branches, you can see what could happen. This can help you try to solve a problem or decide what plan you should use.