This aims to investigate factors influencing the effectiveness of the ISO 9000 quality management system of HCMC-based enterprises. There are 210 respondents who are workers and managers of HCMC based companies using ISO 9000. | JED July 2013| 147 ISO 9000 & Influential Factors Factors Impacting the Effectiveness of the ISO 9000 Quality Management System of HCMC-Based Enterprises NGUYỄN QUANG THU University of Economics HCMC Email: ng-thu@ NGÔ THỊ ÁNH University of Economics HCMC Email: anhnt@ ARTICLE INFO Received: March 20, 2013 Received in revised form March 29, 2013 Accepted: June 15, 2013 Keywords: factors efficiency quality management ISO 9000 enterprises ABSTRACT This aims to investigate factors influencing the effectiveness of the ISO 9000 quality management system of HCMC-based enterprises. There are 210 respondents who are workers and managers of HCMCbased companies using ISO 9000. Measurement scales are established upon seven factors: (1) managers’ commitments, (2) roles of middle managers, (3) participation of employees, (4) internal information system, (5) collaboration of customers and providers, (6) professional consultants, and (7) quality management documents. Research findings indicate that the variable “roles of middle managers” should be left out and the remainders, save for “quality management documents”, have impacts on the effectiveness of the ISO 9000 quality management system. Additionally, some suggestions are also extended to enterprises which have employed or plan to employ ISO 9000 to boost the efficiency of their quality management system. 148 | Nguyễn Quang Thu & Ngô Thị Ánh | 147-160 I. INTRODUCTION ISO 9000 is a quality management system (hereunder abbreviated to QMS) which was first promulgated by the International Organization for Standardization (ISO) in 1987 and was introduced to Vietnam in the 1990s. According to Vietnam Productivity Center (VPC), only 13 Vietnamese companies were awarded ISO 9000 certificates in 1997, but the number rises to 184 in 2000; 612 in 2002; 2,461 in 2005; 4,282 in 2007 and over 6,000 in 2010. The upward trend of the number of enterprises using ISO 9000 indicates that the ISO 9000 QMS has .