This document discusses various cementing additives used to modify cement slurry properties for specific well conditions. It classifies additives as accelerators, retarders, weighting agents, extenders, loss circulation control agents, fluid loss additives, dispersants, anti-setting agents, anti-foam agents, and special additives. Each additive type is described in terms of its purpose and example products used by WEAFRI Well Services Company to control cement thickening time, consistency, fluid loss rate, and other essential properties. The document recommends using cement additives in slurry designs to efficiently control slurry behavior in deep formations.