DFD Yourdon Recently reviewed 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
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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
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supplier of valves‚ pumps‚ and flow controllers to manufacturers of water purification equipment – faced concerns due to the fact that its competitors have been reducing the price of pumps‚ which was a major product line. According to Sippican’s cost accounting system further decrease in the price of pumps would not be acceptable as because of the past price reductions the margin on pumps have already declined from the planned 35% to 5%. Detailed and alternative analysis of the costs – such as Activity
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Analysis Questions: 1. What does the stream look like? Why did you choose the particular stream for the lab? The steam was high. Very high yes‚ I choose my local Ware Shoals. 2. What waterways are upstream that contribute flow to the stream (watershed)? The Little River flows into the Saluda from the north in Newberry County. 3. What is the land use? Roughly what percentage is forest or natural grass land? How much is urban? Agricultural? Ware Shoals is like a small town like Abbevile‚ SC. The
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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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Petty cash fund is a relatively small amount of cash that businesses keep on hand for the purpose of small transactions such as providing change to customers‚ postage expenses‚ highway tolls etc. In such transactions‚ the use of checks is time consuming‚ costly or illogical. Usually a custodian is appointed to administer the petty cash and it is his/her duty to account for the expenses incurred out of petty cash fund. Whenever the custodian makes any payment from the fund to an employee or a customer
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DATA FLOW DIAGRAMS Process Maps Guidelines for Drawing Process Maps Data Flow Diagrams Guidelines for Drawing Data Flow Diagrams REFERENCES AND RECOMMENDED READINGS ANSWERS TO TEST YOURSELF OTHER DOCUMENTATION TOOLS Program Flowcharts Decision Tables Software Tools for Graphical Documentation and SOX Compliance After reading this chapter‚ you will: 1. Understand why documenting an AIS is important. 2. Be able to draw simple document flowcharts and explain how they describe the flow of data
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ME 4600:483 – Lab Notes Revised 04/07/05 Flow Measurement Table of Contents Flow Measurement ......................................................................................................................... 1 I. Objective ................................................................................................................................. 1 II. Apparatus...................................................................................................................
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com Data Flow Diagrams (DFDs) 1 mywbut.com Specific Instructional Objectives At the end of this lesson the student will be able to: • • • Identify the activities carried out during the structured analysis phase. Explain what a DFD is. Explain why constructing DFDs are important in arriving at a good software design. • Explain what a data dictionary is. • Explain the importance of data dictionary. • Identify whether a DFD is balanced. Structured Analysis Structured analysis is used to
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Control of Cash Receipts Internal control of cash receipts ensures that cash received is properly recorded and deposited. Cash receipts can arise from transactions such as collections of customer accounts‚ receipts of interest earned‚ bank loans‚ sales of assets‚ and owner investments. The two important types of cash receipts are: Over-the-Counter Cash Receipts For purposes of internal control‚ over-the-counter cash receipts from sales should be recorded on a cash register at the time of each
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