Quality Management is an organizational methodology to ensure that the business processes in an organization are consistent in terms of producing high quality products. Not a synonym of a Quality Assurance.
Management quality of the product/project is a complex discipline. Through quality management it is possible to influence the cost and time of the product/project. Quality affects not only such activity, such as testing (in the software development area), but also such things (not directly related to the quality), as the qualification of employees, their motivation, etc.