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To enhance and promote quality construction, the Construction Quality Assessment System (CONQUAS) was introduced in Singapore in 1989 to evaluate the quality performance of building contractors using numerical scores. Apart from the CONQUAS system, the ISO 9000 quality management standards were also introduced in the Singapore construction industry in 1991. Is there a relationship between certification to ISO 9000 standards and the achievement of higher construction quality standards as indicated by CONQUAS scores? As several years have passed since the introduction of the CONQUAS system and ISO 9000 in the Singapore construction industry, this paper aims to ascertain if the implementation and certification of quality management systems to ISO 9000 standards in construction firms has helped them to achieve higher construction quality standards through higher CONQUAS scores.