|Just like a headache, questionable quality is a symptom of an underlying problem. And, of course, quality problems can be a real headache, too.|
As a manager, your first step is to try to figure out what is actually causing the quality to be so poor. This can actually be a fairly broad undertaking, since quality problems can be due to any number of factors, including supervisory practices, inadequate training, poor equipment, interpersonal difficulties, and even sabotage.
At this point, rather than merely being available to the employees and giving them feedback, it will be helpful to address the quality issue more directly. Since the issue spans across your department, you should meet your employees individually and as a group to discuss the possible causes and some strategies to deal with them.
From the supervisory standpoint, it will also be helpful for you to make sure that your feedback includes training and coaching. Rather than letting your employees know where the errors are found, provide them with some specific guidance to prevent such errors from occurring in the future.
Some studies have found that employees are more quality conscious when provided with increased autonomy. Once you have given them appropriate guidance, providing them with more autonomy may be a quality move for you to make.