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designing an information system

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Report 3 AO1b When designing an information system you first need to consider the output. The output depends on the type of job. If a very basic job is needed you would use a monitor and a printer. The basic input devices are the mouse and the keyboard. Basic output devices are the monitor, the speakers and the printer. I need to consider alternatives so that I can get the best out of my system. The purpose of an input device is to input data or information so it can be converted into the system. Input devices must be fast and accurate. The cost of the product must be reasonably cheap. ...read more.


There are two main faults that could be due to the keyboard. The Transposition Error Around 70% of errors are transposition errors. This occurs when two letters (or more commonly) numbers are switched with each other. For example, instead of dog a mistake could be dgo or (more commonly) 2345 could be 2435. The Transcription Error This error occurs when the person misreads or mistypes data. This can be caused by reading wrong e.g. 5 = s or 0 = O or the persons bad handwriting. These generally can be corrected due to tools such as grammar checker and spell checker but they don't detect all errors. Proof reading and double checking will insure that mistakes are corrected. ...read more.


Output An output device takes data from the computer and displays it in usually recognizable data for the user to read on screen or paper. There is a range of output devices available for use today, these include: Laser Printers Inkjet Printers Monitor Speakers The output devices that have been available to me are: A 15 inch monitor, a black and white laser printer, an inkjet printer and a colour laser printer. The lasers are very good quality and very fast. Black and white is fine for the payslips. Colour laser printer cartridges are very expensive so with so many employees there is no need for colour. A wider monitor like 17 or even 19 inch monitor would have been useful as I would be able to see more information. ...read more.

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