I believe that the most important aspect of an effective quality control program is to have a clear line of communication between all sides who are working within the project. It is important that everyone knows their position in the project and that the work that they do contributes to the overall completion of the project and that it does not hinder the progress of the other parts of the project.
Furthermore, it is important to point out that typical quality testing is done at the end and with that, I believe that it is more beneficial if quality testing is done as checkpoints during the development process, it will minimize the problems within the system instead of it piling up. This will also save time because it will remove the countless times that the product has to be modified.