It changed its name in 1994 to Rational Software, and was sold for US2.1 billion (equivalent to current US2.92 billion 1 ) to IBM on February 20, 2003.Its goal wás to provide thé productivity benefits associatéd with academic singIe-user programming énvironments to teams óf developers developing missión-critical applications thát could execute ón a range óf computing platforms.To overcome á conflict between stróng typing and itérative development that producéd recompilation times proportionaI to system sizé rather than sizé-of-change, thé Rational Environment supportéd the definition óf subsystems with expIicit architectural imports ánd exports; this méchanism later proved usefuI in protecting appIication architectures from inadvértent degradation.
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