The article surveys different ways to measure how complex software is. It looks at metrics like Lines of Codes, Halstead Complexity Metric, and Cyclomatic Complexity Metric. These metrics help us understand how complicated software is and how hard it is to work with. The article also talks about new ways to measure complexity based on these classic metrics. By comparing these different metrics, we can see how they relate to each other and which ones are most useful for understanding software complexity.