Step 1: Creating the context diagram
Step 2: Creating data flow diagram fragments
Step 3: Creating the level-0 data flow diagram
Step 4: Creating level-1 data flow diagrams (and below)
Step 5: Validating the data flow diagrams
In reality, it is recommended that:
You develop a level-1 diagram first based on each use case
Based on that, produce level-0 fragments and integrate all fragments in a level-0 diagram (if you are experienced, you can directly produce an integrated level-0 diagram without relying on the fragments)
Then finally you can create a context diagram
It may be also helpful if you have the sketch on paper first before using draw.io to complete diagrams.
Health Club Membership System
When members join the health club, they pay a fee for a certain length of time. Most memberships are for 1 year, but memberships as short as 2 months are available. Throughout the year, the health club offers a variety of discounts on its regular membership prices (e.g., two memberships for the price of one for Valentines Day). It is common for members to pay different amounts for the same length of membership. Member will be issued a membership card upon signing up.
The manager wants the system to track each time a member comes into the club. The tracking data will be kept in the system. The system will then identify the heavy users and generate a report so that the manager can ask them to renew their memberships early, perhaps offering them a reduced rate for early renewal. Likewise, the system should identify members who have not visited the club in more than a month so that the manager can call them and attempt to reinterest them in the club.
The club wants to email reminder letters to members asking them to renew their memberships 1 month before their memberships expire. Some members have become angry when asked to renew at a much higher rate than their original membership contract, so that the club wants to track the price paid so that the manager can override the regular prices with special prices when members are asked to renew. The system must track these new prices so that renewals can be processed accurately.
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