en Statistical Process Control Statistical Process Control or Quality Control Statistical Process Control Statistical Process Control or Quality Control پژوهشي Research There has been considerable number of papers published related to Six Sigma applications in manufacturing and service organizations. However, very few studies are done on reviewing the literature of Six Sigma in all the areas including manufacturing, construction, education, financial service, BPOs and healthcare etc. Considering the contribution of Six Sigma in recent time, a more comprehensive review is presented in this paper. The authors have reviewed Six Sigma literature in the way that would help research academicians and practitioners to take a closer look at the growth, development, and applications of this technique. The authors have reviewed various journal papers and suggested different schemes of classification. In addition, certain gap areas are identified that would help researchers in further research. Six Sigma, literature, classification, research methodology, research contents, manufacturing, services, quality initiatives. 13 26 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-766-1&slc_lang=en&sid=1 Virender Narula virender.narula@gmail.com 180031947532846003388 180031947532846003388 Yes Manav rachna International University Sandeep Grover groversandeep@hotmail.com 180031947532846003389 180031947532846003389 No Y M C A University of Science and technology