UCSF

—This paper provides a significant contribution to the knowledge by identifying the impact of ISO 9001 implementation on the most vital factors of project management within large scale (AAA) construction firms in Metro Manila, Philippines. Thus, the study was accomplished an extensive literature review for identifying the main factors of project management, ISO 9001 standard, and other concepts, for developing an appropriate survey instrument. Then the questionnaires were distributed randomly among selected ISO 9001:2008-certified projects of large-scale (AAA) construction firms. For data analysis, the study adopted the descriptive and inferential statistics analysis, in order to find the results and conclusions. Lastly, the findings indicated that ISO 9001 certification can statistically affect the two main factors of project management, except time length of projects in Metro Manila, Philippines.