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This aim determined se'eral diverse actions, each theoretical and complex. On the theoretical aspect, novel semantic paradigms for behavioural technical specs had been in'estigated. and techniques of easing evidence constructions, making use of net and Internet systems, have been recognized. On the technological aspect, integrated programs for specification growth, with emphasis the two on simplicity of use and on proof assistance, ended up carried out. In addition, a number of situation research of considerable dimension had been pursued. To rejoice the profitable conclusion of the venture, a symposium w^as held in Numazu, a seaside city well-known for refreshing seafoods, in April, 1998. On this event, not only thego to website contributors of the venture, but a lot of scientists in varied fields such as algebraic technical specs, expression rewriting, theorem proving, rewriting logic, and class theor}', acquired jointly to have intense but calm presentations and conversations that lasted 4 days. This ebook contains the picked papers by the participants of the symposium. These papers offer with a variety of logics and formalisms fundamental CafeOBJ, and/or with computer software improvement environments ideal for embedding it. Pertinent keywords below are: (basic) algebraic specification, behavioural specification/logic, rewriting specification/logic, order-sorted specification/logic, executable specification, distributed computing, theorem prover interfaces. The paper by Manuel Clavel et al. presents a rewriting logic at perform. An crucial feature of rewriting logic is the existence of a finitely presented universal principle, exactly where an item-level idea can be encoded and reasoned about as a simple object. This kind of an encoding itself can be encoded and reasoned about at a nevertheless increased amount. As a result an arbitrarily increased "reflexive tower could be constructed for describing and reasoning about a large range of difficulties. The paper exhibits two considerable illustrations — an inductive theorem prover and a Church- Rosser checker - that exploit this electricity of reflection. In addition, these examples are composed completely within Maude, a language dependent on rewriting logic with developed-in metalevel reasoning facilities, and are realised as executable instruments. The paper by Alexander Knapp displays another potential of rewriting logic. He has encoded a sizeable fragment of Unified Modelling Language (UML) into rewriting logic. The characteristics pertinent for this situation review are that rewTiting logic is a all-natural discussion board the place object-oriented programming and nondeterministic, concurrent computation are introduced, reasoned about, and executed. In this illustration, the static facets of UML collaborations are formulated as relations between objects and their dynamic factors are captured by concurrent rewTite policies. Like the perform reported in the paper by Manuel Clavel et al., this work also resulted into an executable specification (created in CafeOBJ in this circumstance).