The paper aims at presenting a conceptual modelling expert system so-called ALECSI to support requirements engineering. The tool takes user requirements expressed either with natural language sentences or in graphical form as input and produces conceptual structures. During this process, ALECSI supports both knowledge engineering tasks (acquisition, modelling, validating...) and process engineering tasks (guidance, explanation...). The last section of the paper simulates an ALECSI session in order to illuswate with examples the guidance provided by the tool during the requirements engineering phase.
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