Business Processes

This chapter shows you how to read and interpret three types of systems documentation: data flow diagrams, systems flowcharts, and entity-relationship diagrams. We will look at data flow diagrams first. 

Reading Data Flow Diagrams

A data flow diagram (DFD) is a graphical representation of a system. A DFD depicts a system's components, the data flows among the components, and the sources, destinations, and storage of data. Figure 2.1 shows the four symbols used in a DFD.