High-temperature cementing (above 300°F(149°C) remains a complex operation from job design and execution viewpoints. Temperature prediction is of crucial importance and is still a challenge. To design a slurry with excellent properties (thickening time, rheology, stability and fluid-loss) remains difficult in deep hot reservoirs. The execution of the job is also another critical step: accuracy in additive concentration and constant density are not always easy to achieve using normal cement mixing equipment. All these issues make the cementing of a high-temperature/high-pressure well a critical operation. A new global approach is proposed to minimize the risk associated with these operations. Emphasis is placed on quality control of the materials to be used as well as a quality assurance program for the laboratory testing to give confidence in the results obtained. Quality control of the job execution is also heavily emphasized.