Quality assurance methods address quality issues in the output of businesses. Lean and six sigma principles apply approaches and metrics to a process to promote efficiency with a minimum number of ...

The Difference Between 3 Sigma & 6 Sigma. It's a quality assurance truism that you can't inspect quality into a product. For a statistician, the difference between three sigma and six sigma is a ...

Six Sigma is a quality management methodology used to help businesses improve current processes, products, or services by discovering and eliminating defects. The goal is to streamline quality control ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...