THIS PAPER IS A BRIEF HISTORICAL REVIEW OF DEVELOPMENTS IN GRINDING WITH BONDED CBN WHEELS. PRODUCTION GRINDING IS DOMINATED BY VITRIFIED BONDED WHEELS. THE PAPER REVIEWS OPTIMIZATION OF GRINDING SYSTEMS FOR PRODUCTION GRINDING WITH VITRIFIED CBN WHEELS, TAKING AS EXAMPLES THE TWO EXTREMES OF HIGH STIFFNESS CYLINDRICAL GRINDING AND LOW STIFFNESS INTERNAL GRINDING. WHEEL DESIGN, DRESSING AND COOLANT DELIVERY ARE EMPHASIZED.