Techniques and tools for Systems Development.

Techniques and tools for Systems Development.

1. Entity Relationship Diagrams

   • Shows all the entities important to a system and their relationships.

2. Entity Relationship Models

   • A means of showing the relationships of entities.

3. Data Flow Diagrams

   • Describes the flow of data between entities in a system. Processes explain what must happen and arrows show the destination of the data.
   • Entity - represented by an oval shape. The entity is anything that is distinct and unique in its existence. For example, a person.
   • Process - represented by a square box with 3 areas. Top left are is the unique process ID. The top right shows who's responsible
   • Data Type is specified in detail the higher the level of this diagram.

4. Information Flow Diagrams

   • Used to show the flow of information in a diagram linking entities and external/internal parts of an organisation.
   • • Courtesy of uml-diagrams.org

5. Data Dictionary

   • A centralised store of information.
   • Can include data elements, meanings, format, data types & entity names

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