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NoteCards is an information structuring system developed in the Intelligent Systems Lab at Xerox PARC. A major design goal has been that NoteCards be an adaptable system, that is, tunable or customizable by users for particular applications and styles of use. In this paper, we describe four ways that a system can be adaptable: (1) it can have a flexible underlying conceptual model, (2) its behavior can be parametrized, (3) it can be integratable with other facilities, and (4) it can be tailorable, i.e. users themselves can add new functionality. We discuss the adaptability of NoteCards according to each of the above criteria. Finally, an example of large-scale tailoring in NoteCards is presented.