Follow the Data
You learned about following data in Chapter 7, Explore Entities and Their Relationships . You can apply that heuristic even better by using your ecosystem diagram. For any given piece of data, trace through the connections in your ecosystem diagram to see all the places data might show up.
Consider Figure 7, Context diagram for an example web application. If a user enters data through the user interface, that data goes into the database and could then show up in the administration interface. That data may also go to the payment gateway and could show up in the log file. These are all places to look for symptoms of problems due to invalid or potentially harmful data. In exploring the system, you would want to watch for ...
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