Subject of this paper is description of information system in its entirety, from creation of an idea and the need for development of the information system to its implementation and application in an enterprise. The first phase refers to the need for the system and its planning. Information system is a part of a wider enterprise system. Strategic planning is very important, which outlines the structure of information system. Planning is followed by analysis, which aims to determine the necessary resources for project execution. Those resources relate to money, knowledge, information and skills required for making of the information system. Deviations from the initial plan occur often in this phase, as unforeseen problems arise. The system has to be adapted to most recent and concurrent technologies, otherwise its introduction would make no sense. Third phase, in which concrete and visible work is finally starting, is called formation. The system is being made physically with the help of a series of applications and various methods for production of the information system. Inter-data relations, databases and architecture of program product are formed. Also, production of project documentation is very important in this phase. Penultimate phase is running the information system. Information system has to be thoroughly examined before final implementation. Both users and designers of the system participate in its implementation. Finally, the last phase is maintenance of the system. This primarily refers to its protection and constant improvement and updating.