The project is aimed at the area of knowledge discovery on databases and the application of such knowledge in hierarchical process control. It will include conceptual design of a knowledge discovery process in hierarchical control systems. The formulation of the proposal design will constitute comprehensive approach to solving problems related to processing of extreme amount of data for the purposes of complex system control. Selected methods of data mining , e.g., based on statistical and inductive learning techniques and chosen on the basis of defined criteria, will be compared in terms of several measurable criteria.