Abstract: There have been a lot of defects in recent years and errors may occur in a regular construction routine. In the construction of buildings, mistakes are very common. The time, complexity, budget and schedule of the proposed project can be affected by these major and some minor defects. The intent of this project is to identify and analyse the major and minor contributing problems and their corresponding defects happening in onsite construction work progress that is responsible for causing cost overrun and time delay in construction management and using the six-sigma technique named (DMAIC-Define, Measure, Analyse, Improve and Control) to minimize such defects. Identify the major contributing factors which majorly affects the cost and time it may results in construction delays. And providing the suggestions and solution to mitigate such onsite construction defects. And also through the literature review the features of the problems and defects can be analyse in this review paper.

Keywords: six- sigma, cost overrun, time delay, reducing defects, on-site activities, literature survey.

| DOI: 10.17148/IARJSET.2021.8343