The information system is the foundation of every manufacturing process. This is the system where all the necessary information is collected, stored, kept, processed and delivered in a way that is available to all the members of some organization who want to use it and they have a suitable authorization. In the diploma paper the process of the development of the computer science will be briefly described through the recent history and the connection between business and the segment of the business that deals with the computer science will be emphasized. The great importance will be contributed to the information as the main resource for getting on the computer science market. The strategy of the information system and the integration of the managerial and business part of the business will be discussed. All the information loop lead to managerial information system and are sublimed in its strategic part. It can be assumed that the management recognizes and perceives important advantages of the structured information based on the computerised information system, especially in the domain of making strategic business decisions and more efficient management. In the last part of the diploma paper the maintenance of the mechanical engineering devices accompanied with the examples from practice will be thoroughly described. The importance of the information in the process of maintenance of the devices will be analysed and there will be attempt to categorize them according to their function/meaning.