BASIC STAGES AND MODELS OF INFORMATION SYSTEMS LIFE CYCLE
The system is understood as a combination of co-operating elements adjusted to achieve the objectives in view. Unlike technological systems where the result of its functioning can be concrete actions or some material production which, input data and output result of information systems functioning is information which is non-material by its nature, but functioning efficiency of the organization depends on its quality on the whole. Therefore to study the features of separate stages of information system existence and its life cycle is very important.