Companies in various industries have the desire to achieve excellence and are committed to producing quality products. The companies improve quality by adopting competitive strategies. One strategy implemented by the companies in improving product quality is to use the Six Sigma approach. This study explores related approaches for quality improvement and analyzes the impacts of the application of Six Sigma methods in various industries from articles between 2015 and 2020 from renowned journals. Selection criteria were established and used to select potential papers. 83 articles were selected based on certain predefined criteria. The major findings from this study were that around 37% of the papers showed defect reduction using various tools, compared with other factors such as processes and people. This research found that the application of Six Sigma across industries based on literature studies shows a greater impact on efficiency improvement and the smallest impact on sigma improvement.