As Marc has indicated, without really knowing what the services being provided are, it is difficult to establish if the 3 month window for measuring Customer Satisfaction is adequate.
I do not understand what is so significant about this 3 month window at your organization, mjflkitty, but is it possible for the Internal Customer to be unhappy or dissatisfied 5 months after the service has been provided? If so, the 3 month trigger being used should probably be re-evaluated.
That being said, however, Quality and Customer Satisfaction go hand-in-hand, meaning that they are part of each other.
Quality is not just delivery a product/service that meets the Customer requirements....it's also about meeting the Customer's expectations. We have had this debate in the Cove before. What is the difference between a requirement and an expectation.
One member gave a wonderful example about asking his son to take out the garbage. The son took out the garbage (requirement) but did not open up a new bag in the garbage can (expecation)...thus, the Customer (father) was not satisfied and a Quality service had not been provided in his view.