Understanding Data Flow Diagrams and Entity Relationship Diagrams in System Design
Explore the types of diagrams like Data-Flow Diagrams (DFDs) and Entity Relationship Diagrams (ERDs) used to represent data flow in systems. Learn about the levels of DFDs and basics of ERDs. Discover programs for diagram creation and key resources for further information.
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Presentation Transcript
Diagrams By Nate Silverman
Types Of Diagrams - - Data-Flow Diagram know as (DFDs) Entity Relationship Diagram known as (ERDs)
Data-Flow Diagrams - - - - - - Know as DFDs Graphically represent the flow of data in a system Shows data inputs, outputs and storage points Uses symbols like rectangles, circles, and arrows with short text labels Helps visualize the route data takes Often has levels
0-Level DFD - Level 0 is over simplification of the data flow
1-Level DFD - Level 1 shows the main functions and storage points
2-Level DFD - Level 2 shows the specific functions of how the system functions
Entity Relationship Diagram - - - - Known as ERD, ER Diagram or ER Model Used for database design Uses various connecters and symbols with predetermined meanings Helps visualize two important aspects, the entities within the a given scope and the relationships among those entities.
Programs Basic= draw.io Advanced= dbdiagram.io
Resources All rights of diagrams belong to their respective owners https://www.geeksforgeeks.org/levels-in-data-flow-diagrams-dfd/ https://www.lucidchart.com/pages/data-flow-diagram
