Shaikha Ebrahim Bumjaid and Hafiz Abid Mahmood Malik 2019. The Effect of Implementing of Six Sigma Approach in Improving the Quality of Higher Education Institutions in Bahrain. International Journal of Engineering and Management Research. 9, 2 (Apr. 2019), 134–140. DOI:https://doi.org/10.31033/ijemr.9.2.17.