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Inputting Data - Changing information

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Report Task 3 ~ Further Data Entry and Output Considerations ~ Inputting Data Changing information Having well organised data will always lead to a higher level accuracy when being used by a human operator. When it is easy to see what data values are stored under there corresponding fields there is a much reduced risk of a human user accidentally entering incorrect data, or data into the wrong field. For example in my staff database there are clear data fields that identify what data should be entered under them, for instance the field name 'Phone Number' doesn't leave the user in any doubt as to if they are to enter there post code into it! Data is also easy to change: if you wanted to change the address for Fabio you could simply search for his name (using a query) then move along to the 'address' field and update the data. ...read more.


would be accepted. Verification can only be effectively done by humans as a computer system has no way to determine if data is correct. An example of verification is where two people enter exactly the same data and a computer system compares the two inputs and highlights any errors. Data verification exists in a primitive form, in that of Spell Checkers. Spell Checkers can scan documents and find any data that is not found in its dictionary. This is limited in several ways: The data we enter are not always found in the dictionary, for instance names or addresses. Furthermore data can also be incorrect even though it is spelt correctly. For instance 'there', 'they're' and 'their' are three correct spellings however each are pounced the same yet refer to three different things. System Outputs Hardware is another important consideration when producing any information system. I explore below options regarding printers and VDU's (Visual Display Units, sometimes known as monitors) ...read more.


CRT monitors are considerably cheaper than TFT, however they have depths usually exceeding 50cm, where as a TFT monitor will rarely exceed 2cm.TFT's also have some other clear advantages: they give of a negligible amount of hear and radiation and as they are crystal lit as apposed to filament lit they are a lot safer to users eyes during prolonged use. Both CRT and TFT monitors have several other important attributes that are not necessarily the same on all monitors, these are explored below: Refresh Rate: a number usually between 56 and 160 and measured and Hertz (Hz) this number determines the number of times per second the screen is redrawn - the higher the better performance can be expected. Maximum Resolution: This refers to the maximum number of pixel's then can be utilised on a monitor at any one time. This number is given in terms of the number of pixels vertically times the number horizontally. For example 1024x768. Dot Pitch: Possibly the least important, this number refers to the space in-between each pixel, usually 0.28-0.30 of a mm. Alistair Fenning :: GCSE ICT Coursework ...read more.

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