This paper presents the business processes of the city of Solin, on the example of the Public Procurement of Solin. In practical work, the AS IS and TO BE model of the public procurement of the city of Solin are described in detail with text and pictures. The AS IS model shows exactly which process is the current Public Procurement of Solin, and the purpose of each individual process in the Public Procurement is detailed After the built-in AS IS model all the problems of the model itself were detected and the TO BE model corrected everything that was wrong because they brake the efficiency of the process itself. After explaining in detail which processes were corrected and why this was done, a new model of Public Procurement in BIC design was visualized. Parallel to the practical part of the work using several pictures are shown examples of how the information infrastructure of a city should look like By completing the practical part of the work the order came the theoretical part of the work explaining what exactly can be the informational infrastructure of a smart city, and why it is important for its survival. There are textically defined characteristics that must have an information system to facilitate the functioning of the city, and what is essential to make such a system realistically implemented. At the end of the theoretical and practical part, a brief overview of these two titles was made, which explains why smart cities are the future and what integrated infrastructure brings about the implementation of the concept of the smart city.