The diploma thesis deals with the issue of change management in the company environment according to the project management principles, following the field of e-commerce of the company. The starting point for project processing is the result of a strategic situational analysis of the external environment and the industry sector and the analysis of the current state of the company CONTROLSOUND, s.r.o. considering the strategy of information and communication technologies as well as the marketing strategy. The combination of which creates an e-commerce system. The solution to the problem of managed change is to develop proposals and plans that will serve to implement the project itself and reduce the risk of failure of the change in the compa...