Main problem: Today electronic information is one of the important resources in the management system. Electronic information resources are not only means, but also control flows. For example, any instruction or instruction in the management system is actually a guide to action. At the same time, for example, data on the movement of an object (employees, goods, money, etc.) are information resources, the storage and accounting of which is the basis of the organizational process. Large flows of information require their structuring, and operations on them become time-consuming. One of the ways to solve this problem is the development and implementation of an information system. Purpose: To analyze and design an information system using specialized tools designed to optimize the implementation of the above stages of software system development, using the example of a real business process. Methods: The article discusses the methodologies of CASE tools designed to automate software development processes, namely, the first two stages of the life cycle: analysis and design of a software product. The analysis and design of the business process functionality is carried out using the IDEF0 functional modeling methodology. The design of the database structure of the information system was carried out using the methodology of semantic (information) modeling IDEF1X. Description of the scenario of the designed software for a real business process is carried out using the dynamic modeling methodology IDEF3. Results and their significance: The article substantiates the relevance of the use of modern CASE-technologies in the process of analyzing and designing a future information system, as well as for the purpose of possible optimization on the example of a real business process "Inventory accounting". As a result, a comprehensive business process model was built using tools based on CASE-methodologies. The resulting model, as well as the description of its construction, is a clear example of the use of CASE technologies for software developers, as well as system analysts and IT specialists.