This book presents a structured method, called the Maintenance Management Assessment (MMA), to objectively evaluate and improve the performance of maintenance organizations. Drawing from the author’s extensive experience, it addresses the challenges of implementing effective maintenance management systems in complex environments. The MMA enables organizations to identify strengths and weaknesses, align with company objectives, monitor results, manage resources and risks, and establish a continuous improvement process. It fosters stakeholder participation and buy-in, offering a valuable tool for organizations to assess and enhance their maintenance management systems, as well as evaluate subcontractors’ systems, ultimately optimizing maintenance operations and minimizing losses.