TYPES OF DATA FLOW DIAGRAM: LOGICAL DFD PHYSICAL DFD Data Flow Diagrams (DFDs) are categorized as either logical or physical. A logical DFD focuses on the business and how the business operates. It describes the business events that take place and the data required and produced by each event. On the other hand‚ a physical DFD shows how the system will be implemented. Design Feature Logical Physical What the model depicts How the business operates How the system will be implemented
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Accounting Information Systems INTRODUCTION WHY DOCUMENTATION IS IMPORTANT DOCUMENT AND SYSTEM FLOWCHARTS Document Flowcharts Guidelines for Drawing Document Flowcharts System Flowcharts Guidelines for Drawing System Flowcharts PROBLEMS CASE ANALYSES The Berridge Company FreezeTime‚ Inc. The Dinteman Company Lois Hale and Associates PROCESS MAPS AND DATA FLOW DIAGRAMS Process Maps Guidelines for Drawing Process Maps Data Flow Diagrams Guidelines for Drawing Data Flow Diagrams REFERENCES AND
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In the late 1970s data-flow diagrams (DFDs) were introduced and popularized for structured analysis and design (Gane and Sarson 1979). DFDs show the flow of data from external entities into the system‚ showed how the data moved from one process to another‚ as well as its logical storage. Figure 1 presents an example of a DFD using the Gane and Sarson notation. There are only four symbols: Squares representing external entities‚ which are sources or destinations of data. Rounded rectangles
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Figure 1.0: Entity Relationship Diagram of Generic Academic Performance Monitoring System Figure 2.0: Context Diagram of Generic Academic Performance Monitoring System The figure 2.0 represents the two (2) users of the Generic Academic Performance Monitoring System namely the Administrator and the Professor. The Administrator entity shows the capability to access the system; manage account by modifying account’s profile; managing member’s account such as creating new user profile and updating
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to : Data Flow Diagrams (DFDs) Data Flow Diagrams (DFDs) Data flow diagram (DFD) is a picture of the movement of data between external entities and the processes and data stores within a system Order CUSTOMER Status Message Status Data 2.0 Shipping Confirmation In-Stock Request WAREHOUSE 1.0 Shipping Order Check Status Order Data D1 Pending Orders 3.0 Issue Status Messages Order Data Payment Invoice Manage Accounts Receivable 5.0 Accounting Data Accounts Receivable Data 4.0
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Major Topics Chapter 9 Using Data Flow Diagrams Data flow diagram symbols Data flow diagram levels Creating data flow diagrams Physical and logical data flow diagrams Partitioning Event driven modeling Use case and data flow diagrams Systems Analysis and Design Kendall and Kendall Fifth Edition Kendall & Kendall Using Data Flow Diagrams Unexploded data flow diagrams are useful to identify information requirements Exploded data flow diagrams can be used for presentation
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Assignment 6 Pg 305 2. What is a data flow diagram? Why do systems analysts use data flow diagrams? Answers: A picture of the movement of data between external entities and the processes and data stores within a system. Systems analysts use DFDs to help in the analysis phase by accomplishing the following three things: 1. Requirements Determination 2. Requirements Structuring 3. Alternative Generation and Selection 3. Explain the rules for drawing good data flow diagrams. Answers: Process: A. No process
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Using Data Flow Diagrams Data flow diagram is used by system analyst to put together a graphical representation of data processes throughout the organization. It depicts the broadest possible overview of system inputs‚ processes‚ and outputs. A series of layered data flow diagrams may be used to represent and analyze detailed procedures in the larger system. By using combinations of only four symbols‚ the system analyst can create a pictorial depiction of processes that will eventually provide
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Process Modeling: Context Diagrams and Data Flow Diagrams (DFDs) Introduction Figuring out the business processes for complex systems can be complicated. For example‚ if the goal is to streamline an existing supply chain process‚ your investigation will cross multiple business units‚ perhaps starting with an on-line order‚ a retail store pick-up‚ or a telephone order. How does the current process work to replace items in inventory storage and on retail shelves? Computer systems make these processes
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proprietary and confidential to PeopleSoft‚ Inc. (“PeopleSoft”)‚ protected by copyright laws and subject to the nondisclosure provisions of the applicable PeopleSoft agreement. No part of this documentation may be reproduced‚ stored in a retrieval system‚ or transmitted in any form or by any means‚ including‚ but not limited to‚ electronic‚ graphic‚ mechanical‚ photocopying‚ recording‚ or otherwise without the prior written permission of PeopleSoft. This documentation is subject to change without
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