Six sigma (Quality control standard) 41 Quality control -- 29 Total quality management 18 Standards 10 Quality control- Standards 9 Statistical methods 9 Quality control 8 Production management -- 7 ISO 9000 Series Standards 5 Production management 5 Quality control-Standards 5 Standards -- 5 Civil service -- 4 Leadership 4 Employees -- 3 Industrial management 3 Management 3 Management -- 3 Training of 3 ISO 9000 Series Standard 2 ISO 9000 Series Standard -- 2 Industrial management -- 2 Islam 2 Manufacturers-Quality control-Standards 2 Manufacturing processes -- 2 Organizational change 2 Process control 2 Public administration -- 2 Quality Control 2 Religious aspects -- 2