Question

Construct a Context as well as Level 0 Data Flow Diagram (DFD) of any DVD rental System.
Guidelines / Requirements:
The context level diagram must contain a major process and external entities.
Level 0 diagram must consist of major functions and should work as follows:
There should be 2 streams, or flows of data.
· The customer request to rent a DVD, system check the availability from DVD store, and then system get the details of customer
· Bill will be generated on behalf of the detail of DVD and handed over to customer.
And finally customer gets the DVD after payment in cash.
Purposes:
Ensure that you can analyze existing manual system and can draw Data Flow Diagrams of any proposed system.
Before Starting you should study and understand:
Rules for drawing DFDs.
Differentiate different levels of DFDs.

Answer 1

Answer:

In Software engineering DFD(data flow diagram) can be drawn to represent the system of different levels of abstraction. Higher-level DFDs are partitioned into low levels-hacking more information and functional elements. Levels in DFD are numbered 0, 1, 2 or beyond.