Data Flow technical_representation (Gane & Sarson notation) are used to analyse system relationships and data via a process-oriented workflow.
They do represent graphically data flow through an information system.
They do not illustrate programming logic.
Data flow symbols are used to represent:
• data source
• flow
• storage
• processes
The following excerpt is from page 17 of Digital Solutions syllabus -
Questions can be put to the Digital Solution Syllabus writers:
Either way, use draw.io to create DFDs (with a tiny bit of shape manipulation you can make the elements look exactly like the QCAA Digital Solutions syllabus. Remember, these technical_representation have been around since the 70s):
❗ Datastores are usually left off context level DFDs. ❗
This isn't stated in the syllabus though, but generally level 0 DFDs are designed to show interactions between the system and external entities only.