The purpose of this paper is to systematically improve the performance of engineering assets. This has been achieved using the six-sigma DMAIC methodology: define, measure, analyze, improve and control. Other tools have been used such as fishbone diagram, Pareto-chart, six-hats, quality function deployment, multiple criteria decision making. The methodology was tested by implementing it at the physical plant department at an educational institute in UAE. Primary historical data were collected for the period 2016-2017, and secondary data were collected by distributing questionnaire. It was found that the main identified problems are poor service quality in air-conditioning and Internet. These problems are related to the lack of preventive maintenance strategy, low level of competence and skills, poor quality of spare parts, low labor efficiency and effectiveness. A set of relevant solutions were identified. Implementing six-sigma DMAIC methodology helps organizations sustain best performance and customer satisfaction which result in achieving organizational excellence.