The goal of each business is to achieve a positive business result or profit. To achieve a positive business result, revenues should be higher than expenses. Given that revenues / expenditures are divided into business, financial and extraordinary, we can wonder which of them are the most important, or on which of them should pay particular attention to the company. Given that financial and extraordinary revenues and expenditures are realized through additional business activities of the company (such as issuing shares, lending to other companies, etc.) it is easy to conclude that basic income/expenses are those that are generated by the company's regular business operations. Production companies pay special attention to the management of inventories because without it the costs of the company could be overtaken. For this reason, the goal of each company is efficiently and rationally manage inventories for the purpose of rationalizing and minimizing costs while achieving positive business results. The subject of this final work is inventory management of production on the example of the Franck d.d. manufacturing company. The aim of the paper is to provide on a conceptual example of planning and inventory management in production as well as the impact of seasonality on inventory management planning based on theoretical knowledge of the types of management system. In addition to all of the above, the operating system 1 + 3 is shown on the example from the practice.