The inventory is the amount of different items, which is located in warehouses or transport means and represents the portion of the working capital of a company. It does not matter whether is about a large amount of inventory or a small one, both cases represent a serious problem to every company. Namely, the large amount of inventory could lead to excessive amounts of financial funds that are not in circulation, lack of storage space but also to different breakdowns of the inventory. On the other hand, the small amount of inventory distracts the day to day business activities disturbing the usual sales or production flows. Therefore, the production and/or sales companies have a huge responsibility while they choose an adequate inventory management method. For the purpose of inventory management, companies have at their disposal today a number of traditional and modern methods, but also they have a variety of information systems that are built upon the request of the users. Thereby, it should be taken into account the needs of business organization, but also a role that the adequate warehousing and storage operations have in the process of planning related to the inventory. Finally, it should be taken into account the influence of the selected inventory management method (model) on the company’s cash flows movements. The main objective of this final paper is the consideration of inventory management methods, the role of the warehouse business in managing inventories and information systems that could improve communication and planning processes within business organizations.