Identify the system or process to be modeled
Define the scope and boundaries of the DFD
List all external entities
Identify all major processes
Identify all data stores
Identify all data flows between entities, processes, and data stores
Draw a context diagram with one main process
Add Level 0 processes and connect them with data flows
Decompose each process into lower-level DFDs if needed
Ensure every process has at least one input and one output
Ensure data flows are labeled with meaningful names
Ensure data stores connect only to processes
Ensure external entities connect only to processes
Balance parent and child DFDs
Review the diagram for clarity and consistency
Refine the DFD to remove unnecessary details