Quality is a comprehensive and fundamental rule or belief, for leading and operating an organization, aiming at continually improving performance over the long term.
Improvement is the business of quality department.
But ideas have to come from everyone- from downright to top most. Quality department has the role to oversee that every reasonable improvement suggestion is implemented. It can be compared with project management. If Quality department fail in this project management, employees will lose confidence in the quality department. It is the torchbearer of improvement process.