The market relations development, competition activation, more complex technology introduction and more complex management tasks evoked the necessity of developing the new instruments; first of all, the controlling instruments, that could help observe the changes that were happening both inside the businesses and in the business environment. Managerial decision-making system should operate at a higher speed and with better quality, so it is necessary to develop a formalized approach and a decision-making procedure in order to give the managers the time they need to deal with unconventional situations. This is the reason why controlling as an instrument that supports the decision-making system is becoming increasingly popular in Russia. The author of the present volume refers to his own experience to give his own formal definition to the concept of controlling. He wants to give a definition that is appropriate for the competitive environment where modern companies operate. He would like to define the place the financial controlling instruments occupy within the general corporate controlling system. Besides, the author focuses on the controlling mechanisms used in the construction and development companies.