Level 1 DFD
The next stage is to create the Level 1 Data Flow Diagram. This highlights the main functions carried out by the system. As a rule, we try to describe the system using between two and seven functions - two being a simple system and seven being a complicated system. This enables us to keep the model manageable on screen or paper.
Try to describe what the mail-order system does in a number (two to seven) of short sentences - these sentences become the system's functions. Let's describe the system in two sentences.
Compare your answer with others in the group. Are all the answers the same? If not, why do you think this is so?
The answer is given on the next page, but don't look at it until you've tried to answer yourself.
Next: Answer to Activity 5