The Six Sigma methodology applies a specific problem-solving approach anc six sigma tools to improve processes, products and services. a) This methodology is data-driven, with a goal of reducing unacceptable products or events. Discuss the scope of Six Sigma in terms of data-driven and unacceptable products or events. b) The structured improvement cycle used in Six Sigma is the DMAIC cycle. Explain the different between DMAIC and a Basic Problem Solving methodology. (6) c) A large company has invested more money in Six Sigma over the last 2 years than the savings that it has made to date due to Six Sigma. Should it stop doing Six Sigma now and try another methodology. Give reasons for your answer. (4) d) There is a question usually phrased something like "Should I use Six Sigma or Lean methods to improve my operations?" Summarise these two approaches and then give your answer to this. (6)