The system flowchart in Figure 3-7 documents the flow of data through the company’s computerized system. Thus, it identifies sources of data, the places where data are temporarily stored, and the outputs on which processed data appear. In Figure 3-7, for example, the system flowchart begins with the subscriber request forms and documents the flow of data on these forms through the keying phase, master-file-maintenance phase, and finally, the monthly mailing phase.