Figure 1.7 Location of System Processes
Suppose a data processing system (figure 1.7) is depicted as having 4 identifiable components, or processes.
1. User interface (screen and keyboard)
2. User information processing (line editing)
3. Data processing (data searches/calculations)
4. Data storage (disc)
and there is data flow between each process through a link
1 « 2 keystrokes; screen characters
2 « 3 complete lines, queries; screen of information
3 « 4 Data