What aspect of the Juran Trilogy focuses on the systematic process of maintaining quality?

The aspect of the Juran Trilogy that focuses on the systematic process of maintaining quality is quality control. This process involves monitoring and regulating the ongoing activities and results of an organization to ensure that the desired quality of products or services is met consistently.

Quality control encompasses various techniques and instruments, including statistical process control, inspections, and feedback mechanisms, to track performance against quality standards. The goal is to identify any variation from the expected outcomes early on and take corrective actions to prevent defects, ensuring that processes are stable and predictable.

The other aspects of the Juran Trilogy serve different purposes. Quality planning focuses on establishing the objectives and processes necessary to meet quality goals, while quality improvement emphasizes enhancing processes and products over time. Quality assessment, while relevant in evaluating performance, is not a core component of the Juran Trilogy. Thus, the emphasis on maintaining quality through systematic control mechanisms clearly aligns with quality control as the correct answer.