Final answer:
Refactoring is the product quality technique that focuses on improving maintainability and other desired attributes without changing expected behavior.
Step-by-step explanation:
The product quality technique that focuses on improving a product's maintainability and other desired attributes without changing its expected behavior is called refactoring.
Refactoring is the process of restructuring and optimizing the design of software or hardware systems to enhance their quality attributes such as maintainability, performance, and scalability. It involves making changes to the internal structure of the product without altering its external functionality.
For example, in software engineering, refactoring may involve reorganizing the code, improving code clarity, removing duplicate code, and making the system easier to maintain and modify without introducing new bugs or affecting its intended behavior.