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Abstract'Is TQM a management fad?' This question has been extensively documented in the quality management literature; and will be tackled in this research though a critical literature review on the area. 'TQM versus Six-Sigma' debate, which has also been a fundamental challenge in this research filed, is addressed by a thematic and chronological review on the peer papers.To evaluate this challenge in practice, a primary research in heavy duty machinery production industry have been conducted using a case-study on, J C Bamford Excavators Ltd (JCB), the largest European construction machinery producer. The result highlights that TQM is a natural foundation to build up Six-Sigma upon; and not surprisingly the quality yield in a TQM approach complemented by Six-sigma is far higher and more stable than when TQM with no Six-Sigma focus is being put in place; thus presenting the overall finding that TQM and Six Sigma are compliments, not substitutes. The study will be concluded with an overview on quality management approaches in the heavy duty manufacturing industry to highlight the way forward for the industry.