Reverse analysis as a means of dealing with changes in software products

This masters thesis deals with the difficulties of reverse engineering. The theoretical part describes the essence of reverse engineering including the conditions that need to be met before its implementation, UML tools, methods of creating new information systems, CASE tools and the quality of service provided in the field of information technologies. The practical part talks about developing veterinary clinics information system, specifically the process of changing chosen functions, creating new modules and providing a solution to integration with other connected systems. This approach demonstrates the process of using reverse engineering and evaluates its benefits as well as compares it to the direct implementation of changes to an undocumented system. Both approaches are evaluated based on chosen criteria and their importance