The case study addresses the implementation of a quality control and service level system at NAVEIA, focusing on logistics operations, specifically the service level of carriers. The case study was guided by bibliographic research. Data were obtained from historical data on carrier performance available within the company. In a competitive market, the company adopted measures to optimize deliveries and reduce costs. The research details the challenges faced and the impacts of these changes on efficiency and customer satisfaction. It highlights the importance of rigorous control over carriers and the need for continuous improvements to maintain competitiveness and operational excellence. It concludes that effective supply chain management is crucial for business success.