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Information Systems

Information Systems. C2b. Information & data – what’s the difference?. Data is raw facts & figures which have not been given a meaning. Eg… Information is data which has been processed in some way to give it meaning or context. Eg…. Collecting Data. How is data usually collected?

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Information Systems

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  1. Information Systems C2b

  2. Information & data – what’s the difference? • Data is raw facts & figures which have not been given a meaning. Eg… • Information is data which has been processed in some way to give it meaning or context. Eg…

  3. Collecting Data • How is data usually collected? • Forms (paper based or screen based) • What do you need to consider when designing a form? • Intended audience • Suitable title & logo (if appropriate) • Layout & use of space • Suitable instructions & text

  4. Verification & Validation • What is the difference between the two? • Verification is checking data has been entered accurately. • How? • Most common form = entering data twice (double entry)

  5. Validation • Ensures data is present, is the correct type, in the correct range & of the correct length. • Made automatically by system • Error message displayed if incorrect • Various checks (IWB activity) • Presence/Length/Type/Format/Range/Lookup Tables/Check Digit

  6. Data Capture • Data can be entered by direct data capture • Computer reads data • OMR (Optical Mark Reader) • Scans forms for marks & ticks • E.g. National lottery / Multiple Choice tests • OCR (Optical Character Reader) • Turns paper-based docs into editable computer files • Read picture & turn into text • Activity – advantages & disadvantages of OMR & OCRs

  7. Exam Questions • Link

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