CoSP is nothing but combination of both Segmentation and Paging. Paging is transparent to the programmer. Segmentation is visible to the programmer. Each segment is broken into fixed-size pages. Paging eliminates external fragmentation. Equal page size, good for replacement policy. Segmentation is visible to the programmer. Segmentation allows for growing data structures, modularity, and support for sharing and protection. Each segment is broken into fixed-size pages (paging after segmentation).