Dr. S. O. Duffuaa is a Professor of Operations Research and Industrial Engineering at the Department of Systems Engineering, King Fahd University of Petroleum and Minerals, Dhahran Saudi Arabia. He received his B.Sc. (Honors) in Mathematics and a Diploma in Statistics from the University of Khartoum, Sudan. He obtained his Ph.D in Operations Research from the University of Texas at Austin in 1982. His current research interests are in mathematical modeling, network programming, maintenance systems optimization and quality control. He has published extensively in these areas. His publications appeared in the Journal of Optimization Theory and Applications, European Journal of Operational Research, Journal of the Operational Research Society, International Journal of Production Research, Applied Mathematical Modeling, Journal of Quality in Maintenance Engineering and others. He is on the Editorial Board of the International Journal of Industrial Engineering and he is the Editor of the Journal of Quality in Maintenance Engineering. He is a certified supply chain professional and has consulted to industry on many projects related to maintenance, quality and optimization.Dr. Abdul Raouf is a distinguished national professor and professor emeritus University of Management and Technology (UMT) Lahore, Pakistan. He has retired from active teaching but still involved in consulting and supervising research students. He was a university professor at UMT for more than a decade and prior to that he was Ghulam Ishaq Khan Institute (GIKI) rector, Pakistan. He spent more than ten years at KFUPM Saudi Arabia.  He spent the years 1966-1984 at the university of Windsor Canada, out of this period he was the chairman of the Industrial Engineering Department for 7 years. His contributions to the profession include more than hundred articles in journals of repute, 12 books (authored or edited). He is on the editorial board of quite a few professionaljournals and the editor-in-chief of JQME.

• Maintenance Systems.- Maintenance Strategic and Capacity Planning.- Preventive Maintenance, Concepts, Modeling and Analysis.- Maintenance Work Measurement.- Maintenance Material Control.- Maintenance Operations and Control.- Maintenance Planning and Scheduling.- Maintenance Quality Control.- Maintenance Training.- Computerized Maintenance Management Systems.- Reliability Centered Maintenance.- Total Productive Maintenance.- Intelligent Maintenance.- Maintenance Systems Performance, Productivity and Continuous Improvement.

Dr. S. O. Duffuaa is a Professor of Operations Research and Industrial Engineering at the Department of Systems Engineering, King Fahd University of Petroleum and Minerals, Dhahran Saudi Arabia. He received his B.Sc. (Honors) in Mathematics and a Diploma in Statistics from the University of Khartoum, Sudan. He obtained his Ph.D in Operations Research from the University of Texas at Austin in 1982. His current research interests are in mathematical modeling, network programming, maintenance systems optimization and quality control. He has published extensively in these areas. His publications appeared in the Journal of Optimization Theory and Applications, European Journal of Operational Research, Journal of the Operational Research Society, International Journal of Production Research, Applied Mathematical Modeling, Journal of Quality in Maintenance Engineering and others. He is on the Editorial Board of the International Journal of Industrial Engineering and he is the Editor of the Journal of Quality in Maintenance Engineering. He is a certified supply chain professional and has consulted to industry on many projects related to maintenance, quality and optimization.Dr. Abdul Raouf is a distinguished national professor and professor emeritus University of Management and Technology (UMT) Lahore, Pakistan. He has retired from active teaching but still involved in consulting and supervising research students. He was a university professor at UMT for more than a decade and prior to that he was Ghulam Ishaq Khan Institute (GIKI) rector, Pakistan. He spent more than ten years at KFUPM Saudi Arabia.  He spent the years 1966-1984 at the university of Windsor Canada, out of this period he was the chairman of the Industrial Engineering Department for 7 years. His contributions to the profession include more than hundred articles in journals of repute, 12 books (authored or edited). He is on the editorial board of quite a few professionaljournals and the editor-in-chief of JQME.

• Maintenance Systems.- Maintenance Strategic and Capacity Planning.- Preventive Maintenance, Concepts, Modeling and Analysis.- Maintenance Work Measurement.- Maintenance Material Control.- Maintenance Operations and Control.- Maintenance Planning and Scheduling.- Maintenance Quality Control.- Maintenance Training.- Computerized Maintenance Management Systems.- Reliability Centered Maintenance.- Total Productive Maintenance.- Intelligent Maintenance.- Maintenance Systems Performance, Productivity and Continuous Improvement.

Dr. S. O. Duffuaa is a Professor of Operations Research and Industrial Engineering at the Department of Systems Engineering, King Fahd University of Petroleum and Minerals, Dhahran Saudi Arabia. He received his B.Sc. (Honors) in Mathematics and a Diploma in Statistics from the University of Khartoum, Sudan. He obtained his Ph.D in Operations Research from the University of Texas at Austin in 1982. His current research interests are in mathematical modeling, network programming, maintenance systems optimization and quality control. He has published extensively in these areas. His publications appeared in the Journal of Optimization Theory and Applications, European Journal of Operational Research, Journal of the Operational Research Society, International Journal of Production Research, Applied Mathematical Modeling, Journal of Quality in Maintenance Engineering and others. He is on the Editorial Board of the International Journal of Industrial Engineering and he is the Editor of the Journal of Quality in Maintenance Engineering. He is a certified supply chain professional and has consulted to industry on many projects related to maintenance, quality and optimization.Dr. Abdul Raouf is a distinguished national professor and professor emeritus University of Management and Technology (UMT) Lahore, Pakistan. He has retired from active teaching but still involved in consulting and supervising research students. He was a university professor at UMT for more than a decade and prior to that he was Ghulam Ishaq Khan Institute (GIKI) rector, Pakistan. He spent more than ten years at KFUPM Saudi Arabia.  He spent the years 1966-1984 at the university of Windsor Canada, out of this period he was the chairman of the Industrial Engineering Department for 7 years. His contributions to the profession include more than hundred articles in journals of repute, 12 books (authored or edited). He is on the editorial board of quite a few professionaljournals and the editor-in-chief of JQME.

• Maintenance Systems.- Maintenance Strategic and Capacity Planning.- Preventive Maintenance, Concepts, Modeling and Analysis.- Maintenance Work Measurement.- Maintenance Material Control.- Maintenance Operations and Control.- Maintenance Planning and Scheduling.- Maintenance Quality Control.- Maintenance Training.- Computerized Maintenance Management Systems.- Reliability Centered Maintenance.- Total Productive Maintenance.- Intelligent Maintenance.- Maintenance Systems Performance, Productivity and Continuous Improvement.