next rebasing. Sample rotation is undertaken for specific product groups at different points in time to save on the resources required if all the product groups had their products rotated at the same time. The criteria for choice of product groups to benefit from sample rotation, and the timing of the rotation, should be clearly and openly scheduled in advance according to objective criteria. 7.14 It is important to recognize the interrelationships among the methods for addressing product rotation, product replacement, and quality adjustment. The rotation of CPI