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This essay is going to be about Tesco's and the IT that they use within the organisation to help them function. Tesco's is the largest food retailer in the world. Like lots of other big supermarkets, Tesco's concentrates mainly on building their stores in out of town locations with petrol stations, cafes and large car parks. One of the technologies used is a barcode reader. Tesco's was among the first few stores on the high street to start using barcode readers. Since then barcode readers are now called laser scanners. Almost every item that you purchase in a shop has a barcode on the packaging. These look like a series of thick and thin black lines. The barcode contains details about the product. It also contains a check digit, so that the computer can validate that the data has been read in correctly. The barcode details are scanned into the system by...

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