I can make context diagram, but how to make level 1 and level 2 DFD? Unless I've idea about how software is going to work, making this isn't possible. But in exam it asks me to write a dfd for online examination system lol.
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rajeshpatel15•7mo ago
Start with Common System Functions
For any system (like online examination), think in terms of core business processes:
Level 1 DFD - Break down your context diagram into major processes:
User Management (login, registration, authentication)
rajeshpatel15•7mo ago
Level 1 DFD - Break down your context diagram into major processes:
User Management (login, registration, authentication)
Content Management (questions, exams, results)
Examination Process (take exam, submit answers)
Reporting/Analytics (generate reports, view results)
Level 2 DFD - Decompose Each Process Take one Level 1 process and break it further:
Example: "Examination Process" becomes:
Validate student eligibility
Display questions
Capture answers
Calculate scores
Store results
Practical Exam Strategy When stuck, use this template:
Input processes (what comes into the system)
Processing/Business logic (what the system does)
Output processes (what goes out)
Storage interactions (read/write to data stores)
Quick DFD Rules Each process needs inputs and outputs
Data flows between processes, not between external entities
Every data store should be accessed by at least one process
Number processes: 1.0, 2.0, 3.0 (Level 1), then 1.1, 1.2, 1.3 (Level 2)
shivajikobardan•7mo ago