In 1996, Gregory Stanton, the founding president of Genocide Watch, presented a briefing paper called "The 8 Stages of Genocide" to the United States Department of State.In this briefing paper, he suggested that genocide develops in eight stages that are "predictable but not inexorable" In 2012, Stanton added Discrimination and Persecution which resulted in a 10 stage model of genocide.
The stages are nonlinear, and several occur simultaneously. Stanton's model is a conceptual model for analyzing the processes of genocide, and for determining preventive measures that might be taken to combat or stop each process.
Here it is in an easy to read format.