Abstract
Abstract—The construction industry is one of the main sectors of the Libyan economy, and it is an important industrial sector in terms of economic and social impact and also employment facilities. Currently, the Construction Industry (CI) in Libya contributes 5.2 per cent of the Libyan Gross Domestic Product (GDP), and it employs around 3.2 per cent of the total manpower[2]. This paper will be presented how to use lean six sigma "Define, Measure, Analysis, Improve, and Control (DMAIC)" Methodology to determine and evaluate the most important and frequent factors causing delay in construction projects in the electricity sector (GECOL). Through literature review, a comprehensive list of causing factors delay was determined, such as: slow Decision Making, Lack of experience in construction, improper project feasibility research, Inadequate contractor experience, Inappropriate construction methods, Inaccurate cost estimating, and inadequate fund allocation. A survey based on a questionnaire carried out among randomly selected personal such as project managers, project engineers and top managers in the General department of Projects in the Company, also the main contractors and consultants are involved in this survey, to get their perception as to the significance of these factors in delay of Electricity projects. The data gathered was analyzed using Lean six sigma DMAIC methodology to identify and rank the significantfactors causing delay in Construction Projects in the Electricity sector –Libya. Keywords: Lean Six Sigma, DMAIC, Construction Project, Significant Factors, GECOL.