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Data Flow Diagram Template Powerpoint

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DATA FLOW DIAGRAM

Transcript: D1 SEARCH REPORT DATA FLOW DIAGRAM? MATCH Process Notations INPUT BOOK DETAILS THANKS FOR LISTENING! SEARCH SYMBOLS USED IN CREATING A 2.0 External Entities Notations A graphical representation of the "flow" of data through an information system BOOK DETAILS DATA STORE NOTATIONS BORROWERS DATABASE 3.0 Data Flow Notation DATA FLOW DIAGRAM BORROWERS DATABASE SEARCH INPUT PERSONAL DETAILS TRANSACTION SUMMARY DETAILS BORROW BOOK MODULE VERIFICATION DATA FLOW DIAGRAM D1 REQUEST PERSONAL DETAILS UPDATE DATABASE DATA FLOW DIAGRAM SYSTEMS ANALYSIS AND DESIGN TEAM VOID D1 BOOKS DATABASE 1.0 LIBRARY SEARCH MODULE 4.0 GENERATE SUMMARY 1.0 LIBRARY SEARCH MODULE BORROWER BORROWER

Data Flow Diagram

Transcript: Any data flow leaving a process must be based on data input to the process All data flows are named; the name reflects that data flowing between processes, data stores, sources and sinks. Only data needed to perform the process should be an input to the process. A process should know nothing about, that is, be independent of any other process in the system; it should depend only on its own input and output Processes are always running; they do not start or stop. Analysts should assume a process is always ready to function or perform necessary work. DATA FLOW DIAGRAM DATA FLOW DIAGRAM NOTATION SYMBOLS Topic WHAT IS DATA FLOW DIAGRAM Flow diagrams in general are usually designed using simple symbols such as a rectangle, an oval or a circle depicting a processes, data stored or an external entity, and arrows are generally used to depict the data flow from one step to another. RULES OF DATA FLOW DIAGRAM The Data Flow Diagram (DFD) is a graphical representation of the flow of data through an information system It enables you to represent the processes in your information system from the viewpoint of data

Data Flow Diagram

Transcript: The System Approach Goals and Feedback External Entity Objects we cannot change. We exchange data Nouns Customer, Vendor, Investor Process Activities that alter data Must have input and output Verbs Collect, Modify, Delete Data Store Storage for data File, database, paper … Product catalog, credit file Data Flow Inputs and Outputs Must always be labelled Context Diagram Title page Describe the main system. One process. All external entities. Primary data flows. Primary Subsystems Every system must have a goal. Some processes and data flows are feedback and control loops. System models Physical Process re-engineering Abstract/logical Data flow diagram Existing system New/proposed system Display the primary subsystems. Look for major processes. Corporation by function/ division. Focus on data. Level 0 Number each process (any order). Include all data flows from higher level. Data Flow Diagram Object Within DFD Subsystems Each diagram can explode to a new subsystem to show detail. Top down Work from general to specific. Start with the main problem. Identify all external agents. Bottom up Identify small problems. Extend to other areas. As diagram gets big, change detail. More than 7-9 processes. Split and add a higher level. Systems Input, Process, Output Divide and Conquer Goals and Objectives Control and Feedback Diagramming Systems Common Systems Problems Context Diagram

Data Flow Diagram

Transcript: click play! Aaron: Making the Gantt chart and getting the stuff for the website. Josh & Aaron Text, Audio and videos are being used to create this project. Phones memory card. Using Internet storage, school computers hard drive and home laptops to all create the project. Text Files, Mp3, and Mp4 files. Mp4 and Jpeg files. Josh: Doing the Data flow diagram, making the website shell. Phone to record movies Viewers (target audience) Prezi, Microsoft excel and dream weaver are going to be used to create the project.

Data Flow Diagram

Transcript: Data Flow Diagram (DFD) Data Flow Diagram is a graphical representation of the "flow" of data through an information system, modeling its process aspects. DFDs can also be used for the visualization of data processing (structured design). A DFD shows what kind of information will be input to and output from the system, where the data will come from and go to, and where the data will be stored.

Data Flow Diagram

Transcript: Terminators There are different levels of data flow diagram. The context level or level 0 data flow diagram is basically a diagram showing a very generalized diagram with the terminators linked to the current system as a whole. The next level is level 1. It would have many more processes, with more detail about all aspects of the system. It is important that the direction of data flow is accurately recorded and that each arrow is labeled to show what data is flowing at that point in the diagram. Data Flow Diagram The order has come from a customer; customers are not part of the process order system and so are placed in a terminator. When data flows from or to somebody or somewhere outside the system, that smehow or somewhere is called a terminator. by Ayesha Abdulhakim Al Sagaf Processes The data from the customers are the orders. This information is processed to produce the invoices. The process order is put in a process box. Flow arrows Peter and Irene deal with customer orders. The customer sends in an order to the company and it is checked to see if it has all the information required such as customer name and address and an order for an existing product. If it does not, it is rejected and sent back to the customer. If it does, the order is processed and the other information is printed and filed. In addition, an invoice is generated and filed ready to send to the customer. The actual data output from the system, such as the individual invoices and the printed orders, are recorded for future use. Although this is not kept on computer, the data can still be viewed as being stored. Such data is therefore called a store. Stores It consists of four components which are terminators, processes, flow arrows and stores. Data Flow Digram

Data Flow Diagram

Transcript: Problem After a school orders copies of educational, Peter Sargent's first step is to update his school client master file. Once the updating is complete, he runs a program to create a summary report of the updated school client master. His summary report goes in his business records folder. Draw a data flow diagram for Peter's record-keeping process for educational software, showing all the appropriate details. Data Flow Diagram DFD

Data Flow Diagram

Transcript: Data Flow Diagram By: Bilal Shah What is a context diagram? A context diagram or Data flow diagram (DFD) is a diagram which is used to establish the context and boundaries of the system to be modelled: which things are inside and outside of the system being modelled, and what is the relationship of the system with these external entities. What is a context diagram? What is it used for? It can be used to: define and clarify the boundaries of the software system. It can show the flow of information between the system and external entities. What is it used for? Symbols Click on the boxes to Find out about each symbol. Symbols Process This symbol represents the process in a DFD. There is only one per DFD. Process Data Flow It conveys data between processes, external entities, and data stores and represents data in motion, such as computerized components, messages or bits, or non-computerized components, such as eggs or cake. Data Flow External entity An external entity sends or receives data from the system. It can represent many things including: A person A machine An organization etc. External Entity Customer orders a ticket. Scenario Example

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