Video What's the Difference Between Performance Improvement and Six Sigma? By Joe Willmore Monday, November 13, 2017 0 Comments Bookmark Main Site Sign in Page Don't have an ATD account? Don't have an ATD account? Forgot your Password? Already an ATD customer without a web account? Institutional subscriber? Click here to sign in. Share Member-Only Content Joe Willmore discusses the difference between performance improvement and six sigma. To access this content Join ATD or sign in. Sign In