To understand the meaning behind the definition of “classification of information systems”, it is necessary to indicate which systems are in question. Some still remember the glorious 50s, when various accounting calculations (mainly on wages) were performed using calculating machines with the electromechanical principle of operation. Despite the fact that their performance is quite difficult to compare with modern electronic devices, nevertheless, the simplification of calculations and paper circulation were faster than with the traditional manual approach.
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The classification of information systems of personal data is carried out according to the above criteria, while there is an important difference from other IPs - the need to protect the processed information. This system is a combination of hardware and software designed to process personal data. It may be an automated solution.