Final answer:
Six Sigma is the method that heavily relies on customer feedback, expert information, and root cause analysis for driving process improvement. It is a data-driven quality control methodology aiming to reduce defects and ensure high-quality performance, maintaining improvements over time.
Step-by-step explanation:
A method that heavily involves gathering information from customers, finding expert information, and performing a root cause analysis to enhance process improvement is known as Six Sigma. Six Sigma is a data-driven approach that uses statistical analysis to measure and improve a company's operational performance by identifying and eliminating defects in processes and products. It focuses on customer feedback and objective data gathering and analysis techniques to achieve high quality and performance. It typically involves various steps, such as defining the problem, measuring key aspects, analyzing data, improving processes, and controlling the future state of processes to ensure that improvements are sustained over time.