INF2004F Summary Notes.docx

Computer operators trained to use this system

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Computer operators trained to use this system Difficult to debug batch systems Some job takes too much time – other jobs might need to wait for a long time Real time processing - process data immediately after capture & provide updated information on real time basis - Online, real time systems (OLRS) process input immediately and provide output back to users - Transactions aren’t accumulated into batches; on input are applied immediately to update master file using random access updating - Immediate processing; direct processing- master files are always up to date and response to user inquiries are immediate Advantages: Accessible Errors are known instantly Cost savings Better sales insight – might lead to additional revenue Quick response to inquiries Disadvantages: Server must be always online and available Expensive- increased cost and complexity of system operations Not secure- susceptible to errors arising from erroneous or fraudulent input More sensitive to hardware and software errors Printed output isn’t usually produced i.e. no human verifiable evidence Components of extended supply chain systems: 3 technologies make it feasible: - POS (point of sale) systems- input sales data into computer for immediate processing - Bar coding technology- UPC bar code systems allow all participants in the real time system chain to chare and process the same basic data - EID (electronic data interchange) ordering system- direct computer to computer exchange of business documents via a communications network The output system: Can be manual or electronic or something in between Most manual batch orientated systems with sequential file processing produce very large volumes of output Online, real time electronic systems tend to produce very little reference type output Output controls are designed to check that processing results in valid output and that outputs are distributed properly
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A separate EDP control group is often established to monitor EP operations Typically, an output distribution register is maintained to control the disposition of reports ERPs Highly complex information system – integrates activities from entire organisation Information stored in centralised database – better flow of information Advantages: Easier to maintain and backup data Once updated in centralised database, outdated data no longer available Accessible by other departments Data is captured at once Improve customer service Disadvantages: Time consuming Expensive Vendor dependence Feature and complexity Module 4: Controls and audit of accounting Computer Fraud [chapter 5] Why is computer fraud important? Especially to accountants/auditors?
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