Object of research: economic systems, functioning under conditions of transitional economy. Purpose of research: development of theoretic basis of rating management system, building of complex of economic and mathematical models and methods of its realization providing ES' efficiency of functioning rising. Methods of research: economic and mathematical models, methods of analysis and synthesis, optimization methods, methods of statistical and financial analysis. Results of research: conception of rating management, allowing to rise the management's efficiency under conditions of transitional economy, is developed; unified complex of economic and mathematical models and methods of rating management, allowing to execute the conception of rating management for a wide class of economic systems is suggested; on basis of conception of profit/loss centers in the thesis mechanism and technique of rating management of financial institutes, allowing to make more efficient decisions, are suggested; strategy of r ating management of commercial bank, allowing to consider bank's reliability in the context to efficiency of its financial resources' usage, is developed; the structure of corporate information system, which is built on basis of new information technology and allows to incarnate the developed mechanism and technique of rating management in decision-making systems, is suggested. Novelty: conception of rating management, based on the integral rating complex grade of ES, is developed; complex of economic and mathematical methods and models of rating management, based on ES' classification problem's solution, is unified; mechanism and technique of rating management of financial institutes, which are built on basis of profit/loss centers conception, is developed; strategy of rating management of commercial banks' reliability, based on model of process representation as a trajectory in phase space, is developed; structure of corporate informational system, based on new informational technology usage, is developed. Field of use: regional.