Which fundamental quality assurance concept involves viewing the next person in line to receive a process output as a customer?

The fundamental quality assurance concept that involves viewing the next person in line to receive a process output as a customer is known as "internal customer" focus. This approach emphasizes that each step in a process should meet the needs and expectations of the subsequent step, treating colleagues or departments as customers. By prioritizing the satisfaction of internal customers, organizations can enhance overall quality and efficiency in their processes. This concept is integral to continuous improvement and fosters collaboration across teams.