This study examines the relationship between Total Quality Management (TQM) practices and operational performance in 1200 Australian and New Zealand manufacturing companies. The research aims to determine how TQM practices, both individually and collectively, influence organisational performance. The study evaluates the reliability and validity of TQM practice and performance measures. The findings show that TQM practice intensity significantly explains variance in performance. Leadership, management of people, and customer focus were the strongest predictors of organisational performance. These results align with literature suggesting that behavioural factors like executive commitment and employee empowerment have a stronger impact on competitive advantage than TQM tools and techniques. The study also highlights that while some TQM elements are strong predictors, others are not. The research concludes that TQM is a reliable and valid instrument for predicting performance, with leadership, people management, and customer focus being the most significant factors. The study also notes that TQM is not a failure but rather a complex system that requires proper implementation to achieve its benefits. The study's limitations include the cross-sectional nature of the data and the inability to account for the lag between TQM implementation and performance improvements. Further research is needed to explore longitudinal studies and in-depth case studies to better understand the impact of TQM on organisational performance.This study examines the relationship between Total Quality Management (TQM) practices and operational performance in 1200 Australian and New Zealand manufacturing companies. The research aims to determine how TQM practices, both individually and collectively, influence organisational performance. The study evaluates the reliability and validity of TQM practice and performance measures. The findings show that TQM practice intensity significantly explains variance in performance. Leadership, management of people, and customer focus were the strongest predictors of organisational performance. These results align with literature suggesting that behavioural factors like executive commitment and employee empowerment have a stronger impact on competitive advantage than TQM tools and techniques. The study also highlights that while some TQM elements are strong predictors, others are not. The research concludes that TQM is a reliable and valid instrument for predicting performance, with leadership, people management, and customer focus being the most significant factors. The study also notes that TQM is not a failure but rather a complex system that requires proper implementation to achieve its benefits. The study's limitations include the cross-sectional nature of the data and the inability to account for the lag between TQM implementation and performance improvements. Further research is needed to explore longitudinal studies and in-depth case studies to better understand the impact of TQM on organisational performance.