English is a quality control quality control, it is referred to as the QC, the quality of the demand for access to the operation of technology and processes, such as testing activities.

The task of quality control is a viable quality management planning activities, and then the right to implement and control these activities to ensure that the vast majority of defects in the development process can be found.

Defects in any stage of software development are likely to be introduced. Project quality management process consists of a number of defects can be identified, the process of elimination of defects. "Identification of defects" and "the elimination of defects" have been two different, but here for the sake of simplicity in the unification of "the elimination of" to represent them. The greater the potential defects for the elimination of its higher costs. Thus a mature software development process in each of the potential defects may be introduced after the completion of the stage will be to carry out quality control activities. In order to eliminate these defects include: needs assessment, design review, code walkthrough, unit testing, integration testing, system testing and acceptance testing.