You are a quality manager for a construction company tasked with improving the efficiency and effectiveness of the concrete pouring process for a high-rise building project. The current process is leading to a significant number of defects, delays, and cost overruns, affecting both the project timeline and budget. The management has tasked you with improving the quality of this component to reduce defects and enhance overall product reliability. Critically discuss how you would utilise Six Sigma in addressing this issue.