The paper deals with the process of modelling of behaviour of economic systems using benchmarking and index method. The objective of benchmarking is to understand and evaluate the current position of a business or organisation in relation to "best practice" and to identify areas and means of performance improvement. Any business process can be benchmarked. Benchmarking is a tool to help you improve your business process, to measure your own performance for each variable and begin comparing the results in an "apples-to-apples" format, to determine the gap between your firm and the best-in-class examples and to implement programs and actions for achieving needed result.