There are three different categories of data processing. Manual process means that no machines are used and everything is done by a person and has the most chance of error. This means all calculations, operations, and transferring of data is done by hand. Mechanical data processing is more accurate than manual. Calculators, computer programs and other devices are used on the data however someone
. still has to step in between operations. Electronic data processing is the most accurate. Once the data is input, the computer runs all of the calculations and operations. For more information visit http://www.free-computer-tips.info/tutorials/general-computer/categories-or-levels-of-data-processing.html or http://computer-concepts-tutorial.blogspot.com/2008/01/categories-of-data-processing.html.
