Concept of system design tools

Concept design tools is a process for create new neat and clean plan of System development. We can create new system's process, using various Component.

Data flow diagram (DFD)

A Data Flow Diagram (DFD) is a traditional visual representation of the information flows within a system.
A neat and clear DFD can represent by a drawing,a good amount of the system requirements graphically.
It can be manual, automated, or a combination of both.
It diagrammatic representation of a process, system, sub-system etc.

Data flow diagram Components:

1. Process:

A process is a business activity or function where the manipulation and transformation of data takes place.

2. Data store:

Datastore is a central location of data. It holds the data that is retained in the system.

3. Data flows:

It is represented by the joining arrow. It connects...
Between the process
Form data store to process
Process to data store
Source to process
Process to sink(higher to lower position)

4. External entities:

Entity Relationship Diagram (ERD)

An Entity Relationship (ER) Diagram is a type of flowchart that illustrates how “entities” such as people, objects or concepts relate to each other within a system.
It is a logical structure of a database that can be expressed graphically.
It is the process of database design and the simplicity and pictorial clarity of the database design technique.
ER diagrams use a defined set of symbols such as rectangles, diamonds, ovals and connecting lines to depict the interconnectedness of entities, relationships and their attributes.

Entity:

A definite thing—such as a person, object, concept or event—that can have data stored about it. Think of entities as nouns. Examples: a customer, student, car or product. Typically shown as a rectangle.

Attribut:

A property or characteristic of an entity. Often shown as an oval or circle.

For example: faculty _sub, depart_name, stu_num, Class_roll etc.

Relationship:

How entities act upon each other or are associated with each other. Think of relationships as verbs. For example, the named student might register for a course.

It represented by diamond

Lines:

The flow of information is indicated by the lines in RE Diagram.

It is represented by a line.