مثال على مخططات Data Flow Diagrams DFD
اسم المشروع interview management system
DFD Diagram Examples
المخططات بالمرفقات
DFD context diagram online interview system
DFD level 0 Diagram online interview system
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In this report, we will talk about 3 things:
A. Differences between logical and physical DFD.
B. How to convert between logical DFD and physical DFD.
C. Give an example on logical DFD and example on physical DFD.
First, we have to define the DFD:
DFD (Data Flow Diagram): is a uml diagram that shows the data flow and transformation between the activities in the software,
Briefly, DFD has 2 types:
§ Logical DFD: it’s done in the analysis phase, this dfd is conceptual.
§ Physical DFD: it done in the design phase, this dfd has more technical details.
Steps to convert logical DFD to physical DFD:
1. Processes: decompose each process to a more detailed processes, and put the implementation technology to be used in it.
2. Data flows: each data flow should have the following details: implementation method(database command if exists, display method if exists, storage method if exists, …etc),
3. Data stores: determine the type of each data store in the dfd, whether it is a database or a table from database or a file or even a tape or any other form of storage.
