Different scholars have explained Six Sigma in various ways, like metric, philosophy, management system and a problem solving methodology. This particular video will help you understand Six Sigma as a philosophy. The evolution journey had lessons learnt for organizations and they used these lessons learnt as Philosophical takeaways. Three thread were imperative learning Customer Focus, Employee Engagement & Distaste to defect and variation. Defect would mean any non-conformity in a product or service or any product characteristic that does not meet the customer requirement. So if you are doing an account set up and you've made a small typo error, which could mean a defect or if you are selling a calculator and if one of the keys of the calculator is faulty. That's a defect Defective is a unit with one or more defect i.e. if one no more keys is faulty, then the calculator is being referred to as defective calculator. Please look at other videos as well from Advance Innovation Group for deeper understanding of the subject.