Chpt 4 outline - DFDs and Flowcharts

Chpt 4 outline - DFDs and Flowcharts - Connectors: Rules of...

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CHAPTER 4 OUTLINE – DFD’s AND SYSTEM FLOWCHARTS DATA FLOW DIAGRAMS Data flow diagrams (DFD) – Where are DFD’s used? DFDs consist of only four symbols: Bubble – Arrow – External entity – Data store – The basic concepts of a data flow diagram: explode and balance o Explode: o Balance:
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Balanced DFDs Balanced DFDs explod balance input balance output explode Example of Exploding and Balancing
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Three types of DFDs: 1. Context diagram – What does a context diagram depict? How many bubbles are used? Example: 2. Physical data flow diagram What is shown? What parts of speech are used?
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3. Logical data flow diagram What is shown? What parts of speech are used? Physical versus Logical DFDs Physical versus Logical DFDs Same business process being described from two different perspectives. Both views however use underlying IS model: Input Process Output
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SYSTEMS FLOWCHARTS Systems flowcharts –
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Flowcharting Guidelines Setup Divide into columns: General flow:
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Unformatted text preview: Connectors: Rules of construction Sandwich rule: Connecting documents on the flowchart: Creating documents and terminating documents: Manual processes should not be used to send or file a document; these are self-explanatory. Flowchart example: Each evening the shipping department at Aegis Company forwards, to the billing department, copy 2 of all shipping notices for goods shipped to customers that day. The next day a billing clerk starts the billing process by obtaining unit sales prices from a price list book and noting the prices on the shipping notice. He then types a three-part invoice for each shipment, mails the original (copy 1) to the customer, and files copy 2 along with the shipping notice by customer name. From invoice copy 3, the clerk prepares a batch total, staples the total to the batch of invoices, and sends the batch to the data processing department. To data control...
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This note was uploaded on 09/28/2011 for the course ACCT 307 taught by Professor Scrowley during the Spring '08 term at S.F. State.

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Chpt 4 outline - DFDs and Flowcharts - Connectors: Rules of...

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