R Rational Unified Process A proprietary adaptable iterative software development process framework consisting of four project lifecycle phases inception, elaboration, construction and transition. Recoverability: The capability of the software product to reestablish a specified level of performance and recover the data directly affected in case of failure [ISO/IEC 25000]. See also Reliability. Redundancy: Multiple occurrence of the same information indifferent places. Release: Aversion of the solution released for installation and use by the customer/end users. Reliability: The ability of the software product to perform its required functions understated conditions fora specified period of time, or fora specified number of operations [ISO/IEC 25000].