Data flow analysis is a special skill that is used to accumulate information from a number of values which are obtained from different processes. The analysts then make a special graph or follow chart that allows them to visualize the entire program and helps them understand which variables to incorporate where.
This data flow analysis helps developers to understand and study the internal complexity of the code. They can easily manipulate, understand and influence different aspects of the code. This in turn allows them to control it efficiently, which helps them incorporate tee desired changes in the code with relative ease.