Quality America, founded in 1982 and based in Tucson, Arizona, develops Statistical Process Control (SPC) software and provides Lean Six Sigma, Quality Management and SPC training materials, including books, online training and on-site blended training. It has served tens of thousands of companies in over 25 countries. Its software line includes SPC-PC IV Explorer, SPC IV Excel, Green Belt XL and QA-Calibrate gage calibration software.