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NoteCards is an extensible environment designed to help people formulate, structure, compare, and manage ideas. NoteCards provides the user with a "semantic network" of electronic notecards interconnected by typed links. The system provides tools to organize, manage, and display the structure of the network, as well as a set of methods and protocols for creating programs to manipulate the information in the network. NoteCards is currently being used by more than 50 people engaged in idea processing tasks ranging from writing research papers through designing parts for photocopiers.
Halasz et al. (1986) studied this question.