An application processes test results from a manufacturing facility, then generates and archives quality reports. The application runs on an old, but still supported UNIX system. It was developed by…

An application processes test results from a manufacturing facility, then generates and archives quality reports. The application runs on an old, but still supported UNIX system. It was developed by an organization's IT department 10 years ago. While it has not been changed in over five years, the application source code and skills needed to modify it are still available internally. What is this an example of?