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Attributes and Entities
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idef1x Crowsfoot Chen Models
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Data Flow Diagram - Exercise
Objective:
Interpret data movement, processes, and stores in a data flow diagram (DFD) using standard notation.
Background / Overview
In the preceding lesson, you learned that a DFD shows
who
interacts with data (external entities),
how
data is transformed (processes),
where
it moves (flows), and
where
it rests (data stores). In this exercise, apply those ideas to a small DFD excerpt.
Instructions
Examine the DFD excerpt below.
Answer both questions in your own words. Be concise but specific.
This exercise is worth 20 points (10 points per question).
Sample data flow diagram excerpt.
Answer the following:
What do the
parallel lines
located between the Vendor and Clerk squares represent?
In a single sentence and in correct order, summarize how data is handled in this diagram.
Submit Your Exercise
Type or paste your answers in the box below, then click
Submit
to view your results page.