RUP means Rational Unified Process. RUP is a methodology for developing architecture-centric and user-driven software. The RUP process has four phases, and each phase involves six development disciplines; business modeling, requirements, analysis and design, implementation, testing, and deployment. For example, a business analyst uses the RUP method to list requirements that help track how each service piece contributes to business value. The essential principle of RUP is to focus on risks and project quality.