Now think about the world you know. What's going on that you find interesting, or that's causing a problem for you or others? Whatever you select, it should be something that might change over time, get better or worse, or perhaps get stuck.
Then fill out the chart to answer these simple questions to figure out this thing is actually a system, and not just a heap, collection, or group of things.
If your answer to each question is "yes," then you have confirmed that it is a system. If it's not, try something else!