The objective of this paper is to use an integrated approach to examine key determinants of firm competitiveness along three capability-based constructs namely: quality, marketing, and knowledge management systems. Competitiveness framework underpinned the conceptual developments in this paper, which enabled the development of the nine hypotheses. The analysis was based on a valid response of 193. The findings revealed significant positive influence of the nine independent variables on business competitiveness. This research provides useful information for businesses in building critical capabilities to create and maintain competitive positions in the marketplace. This paper would also be useful in enriching theory for future research in the subject area.