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The more and more rigorous regulations on the environmental protection, as well as the need for a much better fuel exploitation, have raised greater demands on the designer. The development of numerical methods and, at the same time, a computing power growth, makes the checking of new ideas possible, even in the early stage of the engine development. The paper aims at presenting a survey of all the possibilities offered by the AVL-BOOST software produced by the firm AVL from Graz: A graphical interface, that enables the user with only a basic knowledge of a simulation technology to master the computer programme in a very short time, has been described too. A one-cylinder engine model has been presented and its operation simulated. The results thus obtained have been analyzed. [ABSTRACT FROM AUTHOR]