FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Logical DFD-This type of DFD concentrates on the system process, and flow of data in the system. For example in a Banking software system, how data is moved between different entities. Physical DFD-This type of DFD shows how the data flow is actually implemented in the system.

Detailed explanation-2: -A logical DFD can capture current and necessary activities required for a process. A new logical DFD models a new set of activities and functions. A current physical DFD depicts the current software, hardware, databases and people to carry out the activities, and new physical DFD models a new system implementation.

Detailed explanation-3: -Architectural Design-The architectural design is the highest abstract version of the system. It identifies the software as a system with many components interacting with each other. At this level, the designers get the idea of proposed solution domain.

Detailed explanation-4: -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-5: -A data flow diagram shows the way information flows through a process or system. It includes data inputs and outputs, data stores, and the various subprocesses the data moves through. DFDs are built using standardized symbols and notation to describe various entities and their relationships.