To design the methodology of performance measurement for maintenance management system. This research was started by studying of the articles and concepts that relate to the mainenance system. The maintenance system in industries was studied. The structure and activity of maintenance management system were concluded. The performance indicators of the activities were identified. The design of performance measurement of maintenance management system was performed using Delphi Technique, Analytical Hierarchy Process and Pairwise Comparisons method. The methodology of performance measurement was then reviewed by experts who have worked in the field of maintenance management. Finally, the performance measurement designed was applied to a petrochemical factory. This research resulted to (1) the activity structure of the maintenance management system divided into 3 sections, which were Maintenance Organization Management, Maintenance Resource Management and Maintenance Operation Management. (2) the maintenance management system performance indicators were classified into (a) the subjective performance indicators such as clear of policy, mission, objective and goal, job description, personal responsibility and personal satisfaction (b) the objectives performance indicators such as preventive maintenance ratio, maintenance planned and scheduled ratio and breakdown maintenance ratio. (3) the questionnaire of the performance measurement for a maintenance management system consisted to the procedure and the subjective and objective performance measurements. Moreover, the result of applying to the factory found that the performance measurement for a maintenance management system could reflect the exactly potential of maintenance management in the organization to the management and feedback information to guideline for improving and developing the maintenance system.
