VISUAL BASIC

Detailed explanation-1: -Entities-Entities are source and destination of information data. Entities are represented by a rectangles with their respective names. Process-Activities and action taken on the data are represented by Circle or Round-edged rectangles.

Detailed explanation-2: -Simple example of a Data Flow Diagram As you can see from the picture the rectangles represent external entities. These could include a password, or code a user would have to enter. The external entities relate to the main process of the system. basically they give the inputs of the system.

Detailed explanation-3: -A data flow diagram shows how data is processed within a system based on inputs and outputs. Visual symbols are used to represent the flow of information, data sources and destinations, and where data is stored.

Detailed explanation-4: -External entities are represented by squares as the source or destination of data. Processes are represented by rectangles with rounded corners. Data Flows are referred to by arrows to denote the physical or electronic flow of data.

Detailed explanation-5: -A Data Source is the origin and/or destination of data, sometimes referred to as external entities. 1) Processes cannot have only outputs, cannot have only inputs, and must have a verb phrase label. 2) Data can only move to a data store from a process, not from another data store or an outside source.

Detailed explanation-6: -Data flow diagram entities also are called terminators because they are data origins or final destinations.

Detailed explanation-7: -External entity: an outside system that sends or receives data, communicating with the system being diagrammed. They are the sources and destinations of information entering or leaving the system. They might be an outside organization or person, a computer system or a business system.