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In this paper we present OASIS 2.1, the last version of OASIS. OASIS is a formal, OO Specification Language developed in DSIC ([1] [4] [6] [8] [7] [12] [11]). In its initial versions, the Software Development Environment associated to the Language was formalized using first order theories that evolve over time. This lead us to a Logic Programming environment with the complement of a for dealing with...