Pegasystems recommends the use of an Agile delivery model for a Pega application implementation. Usually customers report that the Scrum-based standard delivery model is well- suited for implementations. In rare cases where a more Waterfall based implementation methodology is better suited, Pegasystems recommends using an iterative, waterfall delivery process. These two proven implementation methodologies can facilitate the breakdown and delivery of incremental processes changes into production environments. The Pegasystems delivery approach has two primary stages: