How to Get Started Drawing a Detailed Data Flow Diagram (DFD)

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DESCRIPTION (lectures 7 – 9)

Looking inside a complex process on a Data Flow Diagram can reveal hidden data and uncover potential problem areas. The first step toward ultimately exploding or levelling a process is to identify the internal processes that will become visible on a more detailed Data Flow Diagram. The problem is that a detailed DFD should never have more than 7 plus/minus 2 processes. How do you know which processes to represent? In lectures 7-9 you will learn how to identify the “RIGHT” Processes for a Data Flow Diagram (DFD).

Lectures 7-9 answer questions like:
• What does “exploding a process” mean?
• What is the business value of doing it?
• What processes will the lower level diagram contain?


This KK is part of an eCourse (VIEW FULL COURSE DESCRIPTION AND OUTLINE at In this course you will learn the answers to these questions:
• What is a Data Flow Diagram (DFD) and what does it do for you?
• What is the difference between a Rigorous Physical Process Model and a Context-Level DFD?
• What symbols can you use on each type of diagram?
• What is the business value of exploding or levelling a DFD?
• What is a simple approach for drilling down into a process?
• How can you show the internal processes and flows that produce the results?
• What does balancing a Data Flow Diagram mean and what is the business value?
• What is the most efficient approach to balancing a DFD?
• What business value do detailed process specifications offer?
• How can you express detailed specifications for processes and data?
• What is “metadata” and why do you need it?
• What does a fully balanced DFD look like?
• What value does a DFD fragment provide?

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