Maintenance management and the existence of maintenance management systems are fundamental challenges for companies subject to the increased competitiveness imposed by modern societies. This type of management is complex, requiring systematic approaches where it is essential to coordinate the different interdisciplinary aspects of maintenance in public and/ or private organisations. It is crucial to seek continuous improvements and balance their benefit and cost to maximise the positive contribution of maintenance to overall profitability and sustainable expansion. This article presents a study on improving management systems and computerisation of a private organisation’s maintenance activities. This company is within the market segment of service provision in the area of laboratory testing. In this area, there is a lack of studies regarding maintenance management. The Maintenance Management proposal developed in this work integrated the company’s Management Systems focused on the Quality Management vision. LEAN philosophy was used for the diagnosis and identification of existing problems. And a management model was developed to allow the company to improve maintenance activities, maintenance management and control it, thus increasing its efficiency and effectiveness. The Maintenance Management proposal is based on the Computerized Maintenance Management System. With this study, it was concluded that no sudden changes should be introduced in order to obtain results as soon as possible. The changes should be gradual, planned, programmed, and controlled to test, evaluate and validate the proposed solutions to be implemented.