n The set of frames candidate for replacement is considered as a circular buffer n When a page is replaced, a pointer is set to point to the next frame in buffer n A use bit for each frame is set to 1 whenever u a page is first loaded into the frame u the corresponding page is referenced n When it is time to replace a page, the first frame encountered  with the use bit set to 0 is replaced. u During the search for replacement, each use bit set to 1 is changed to 0