Abstract— Inspection is one of the major activities that assure the quality of products and services. In the last few years, inspection jobs became highly demanded in the energy construction industry. However, finding qualified people to cover this demand is considered a difficult task. Assuring quality in the procurement phase in large construction project is essential. Inspection is required during the manufacturing of major equipment and materials in vendor premises. A process that test and qualify vendor inspectors and assure that they are competent to do their critical job is needed. Moreover, the process time cycle should be as short as possible, in order to match the construction phase requirements. The process of qualifying vendor inspectors was noticed to have long cycle time and variations in time starting from receiving the request until giving back the result. The process also is not giving consistent results. This paper reports on a study to improve and optimize vendor inspectors’ qualification process. This was done using the lean six sigma methodology. The study findings proposed six recommendations: utilize an online exam system, fix exam date and location every year, establish a common procedure for the process, utilize standard CV templates and a rejection rate for CVs and establish a continuous process for developing exam questions. Index Terms— inspection qualification; lean six sigma; procurement; quality improvement, Saudi Arabia I. INTRODUCTION Six sigma technique represents a problem solving methodology to eliminate the root causes of defects in processes. In this way defects and variability and its associated costs can be reduced. It is considered as a customer focused approach, by which the emphasis is that defects are factors which increase costs and reduce customer satisfaction [1]. It is a combination of quality management methods, including statistical methods [2]. The sigma level indicates how frequently defects are occurring. Higher sigma level means that process would produce fewer defects. Another way of reading in six sigma language is through identifying the number of defects per millions The writers appreciate the support of King Fahd University of Petroleum & Minerals during the course of the study. Abdulaziz A. Bubshait is a professor of construction engineering and management and Dean of college of Environmental Design, King Fahd University of Petroleum & Minerals, Saudi Arabia, Dhahran 31261 (phone: 966-3-860-2580; fax: 966-3-860-2539; e-mail: bushait@ kfupm.edu.sa). Haitm A. Al-Hamdan was a graduate student, department of construction engineering and management, King Fahd University of Petroleum & Minerals, Saudi Arabia, Dhahran 31261 (e-mail: g200361050@kfupm.edu.sa). opportunities. A six sigma level means that there are 3.4 defects per million opportunities (DPMO) [3]. Six sigma focuses is to improve the overall quality by making organizations produce their services and products better, faster and lower costs [1]. A six sigma process means that 99.99966% of the manufactured products are expected to be free of defects [2]. Different studies estimated that if six sigma is implemented, it could provide three or four times more gains than the cost of applications without six sigma. Firms that are at 3 or 4 sigma level spend 25 to 40% of their revenues to solve problems. On the other hand, six sigma level firms spend no more than 5% of their revenues to solve problems [1]. Six Sigma projects follow a standard methodology known as DMAIC. This five steps problem solving methodology is considered as the core of Six Sigma strategy [4]. DMAIC is an acronym for the 5 phases of Six Sigma projects: Define Measure, Analyze, Improve and Control. These phases help to move logically from defining the problem to implementing solutions, understanding causes and establishing best practices in order to assure that solutions stay in place [5]. The company understudy is an integrated global energy enterprise. The company is continuously executing a series of new mega projects that will help meet the worldwide energy demand. As quality is considered an important aspect in all the company’s work and projects, there is a separate department called Inspection Department taking care of managing quality implementation during all phases of new projects. Under this department comes the vendor inspection division (VID), which focuses on managing the quality of procured materials and equipment. VID consist of three units: Quality Control Unit, Quality Assurance Unit and Quality Monitoring Unit. Moreover, there are Responsible Inspection Offices (RIO) in different locations worldwide that support the inspection department to perform mentioned functions. These RIOs are located in Tokyo, Shanghai, Singapore, New Delhi, Hague, Milan and New York. Vendor inspector is the main person who conducts inspection in vendor premises. His qualification and testing is an essential process in order to assure overall procured material quality at the end. The objectives of this study are: 1. To streamline the process of vendor inspectors’ qualification. 2. To reduce the time required for qualification to a target of 10 days maximum. Optimizing Vender Inspectors’ Qualification Process Using Lean Six Sigma Abdulaziz A. Bubshait, and Haitm A. Al-Hamdan Proceedings of the World Congress on Engineering and Computer Science 2013 Vol II WCECS 2013, 23-25 October, 2013, San Francisco, USA ISBN: 978-988-19253-1-2 ISSN: 2078-0958 (Print); ISSN: 2078-0966 (Online) WCECS 2013