Write a comprehensive research paper covering the principles of Six Sigma and Lean. Include an introduction, meaningful but not very long. Describe Six Sigma principles in detail, including description of each component of DMAIC. Describe Lean methodologies in detail. Also, describe Lean Six Sigma. Provide at least 5 meaningful citations from the book ‘A Guide to Six Sigma and Process Improvement for Practitioners and Students’ by Giltmow & Melnyck; 2nd Edition. Plus cite from 2 more academic sources. Do not cite Wikipedia, consultant websites or industry trade magazines.