In the last few decades, the Slovenian business environment has experienced a number of transitions, market, political and financial changes. Companies, which failed to incorporate these changes into their strategies, quickly fell into difficulties or went into liquidation. Managing change is of key importance if companies or organisations want to remain competitive. As a means of support companies can employ various approaches, techniques, tools and models; these, however, are not always adapted to the needs - deriving from the strategy and the environment - or the type of the company, especially if these are small or medium-sized enterprises. This article presents the concept of a generic model for managing changes. Based on simulation, this model will support the management of small and medium-sized enterprises in detecting problems, defining solutions and implementing necessary changes in business processes. With the developed model a simulation of changes in balance sheet data for sales and the profit achieved was carried out, the goal of increasing sales defined and the limits set. The model offered seven opportunities which have all been commented on appropriately. By utilising this model, a static company changes into a dynamic one capable of quick restructuring whenever necessary. [ABSTRACT FROM AUTHOR]