What is data flow diagram ppt

Data Flow Diagram Purpose — visually depict how data moves and changes through a top-down, logical model Logical model — requirements and the relationship.

Hoffer Joey F.

DFD(Data Flow Diagram)

No internal logic should be shown like loops, if-else, this is not a flow chart In order to keep the diagram uncluttered, you can repeat data stores and external entities No process can have only output data flows a miracle.

It must be properly labeled It must not be repeated in a diagram Ticket Booking.

what is data flow diagram ppt

Data Store Data stores are places where data may be stored. All the external entities should be identified and shown. Data cannot move directly from an external entity to a data store without a process.

Data Flow Diagram Presentation by The Seas

Copyright 2002 Prentice-Hall, Inc. It should consists of 5-9 processes bubbles. Never shown in context level diagram No direct data flows between two data sources Symbol: Please wait. This information may be stored either temporarily or permanently by the user.

Presentation on theme: A Data store can appear as a sink or source within level 2 DFD. George Joseph S.

what is data flow diagram ppt

This type of computer. The basic rules: No process can have only input data flows black hole.

what is data flow diagram ppt

Make sure each process has at least one input and one output. Data Flow Diagramming Rules Processes —a process must have at least one input —a process must have at least one output —a process name except for the. Upload Log in. Auth with social network: Represented by rectangle: No data store can be shown in context diagram as they are internal to the system only.

Do not put verbs in the data flow description as this implies a process. About project SlidePlayer Terms of Service. Please wait....

what is data flow diagram ppt

If you wish to download it, please recommend it to your friends in any social system. Must be named No direct data flow between two entities ever.

what is data flow diagram ppt