Mutual communication is one of the fundamental elements of human society. Its development has been enabled by sharing of sources and knowledge. Nowadays, information is considered to be one of the "production sources", some people regard it to be the most important one. Without the necessary information no company can succeed. Not only gaining of information is important, but also its spreading inside the company. Internal communication departments are in charge of these issues. The aim of this diploma thesis is to analyze internal communication of the company Johnson Controls International ltd., specifically in its Czech subsidiary (in the department of building maintenance), to identify the weak points of the internal communication and to...