New methodologies of software development were adjusted and implemented because of the needs for faster software development and to limit the risks for unfulfilled goals. Waterfall as a methodology was replaced by the agile methodologies. These follow the principle of evolutional development. There are many agile methodologies. Most known methodologies are Scrum, Kanban, FDD, XP, Crystal ... Their implementation into the company is still a challenge because it depends on many factors like: the culture of the company in developing software, skills of the employees, types of projects developed by the company and many other factors. In academics for implementing agile methodologies, a new approach was defined. The approach is called situational method engineering. This approach uses all the characteristics of the company and suggests approaches that are taken from agile methodologies. There is a lack of this approach in academics because it needs deep understanding and cooperation with different experts. The goal of the master's thesis is done very precise analyse of the SME, customize and use it for developing an agile methodology for the company that develops software.