Can you describe the system only using this diagram. Remember the shape of each box has a different meaning...

...becomes the Customer Accounts File used as input for the next Update run.

The old Customer Accounts File is not destroyed...It is kept in case of problems arising. The update run can always be done again.

Computer people refer to generations of computer files. In the above diagram, the Customer Accounts file is called the 'Father' file and the new Updated Customer Accounts File is the 'Son' file.

On the next update run...the 'Son' file becomes the 'Father' file, and the 'Father' file becomes the 'Grandfather' file etc...

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