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This paper introduces a task model for redesign of compositional knowledge-based systems based on a generic task model of design. A generic task model of design provides an abstract description of a design task and a generic structure which can be refined for design tasks in specific domains of application. A generic task model of design, shown to incorporate redesign, is presented and refined to a task model for redesign of compositional knowledge-based systems. The applicability of this task model will be illustrated for the redesign of a diagnostic knowledge-based system.

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