In today s economy, the competitive advantage of companies can be directly linked to its ability to utilize the knowledge held by its members. However, to add value to an organization, this knowledge must be shared. Thus, the organization s ability to integrate and apply the expertise of its workforce is essential to achieve and maintain an organizational competitive advantage. The knowledge management systems help to create, collect, organize and disseminate knowledge. However, these systems have limitations, such as the difficulty of integrating knowledge from different sources, usually because of the lack of semantics in his descriptions. The main objective of this dissertation is to study the technological limitations of existing knowledge management systems and propose solutions through the adoption of Semantic Web formalisms. To achieve this goal, is used as a study case the knowledge management system in production of a large Brazilian company, which supports the operation of its IT infrastructure. This study demonstrates that this approach can add additional semantics to existing data, integrating previously isolated databases, creating a better operating result.