In most hypertext the contents of nodes and the positions of links are fixed. Making these elements dynamic can help writers solve structural problems and help prevent navigational dilemmas for readers. The hypertext poem A Life Setfor Two demonstrates several techniques for doing this. Floating links are positioned dynamically in response to the reader's progress. Variable nodes change their texts according to factors such as their context within the current reading. The texts of individual nodes are also influenced by global states-settings that can be changed manually by the reader or automatically by the program.
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Robert Kendall (1996) studied this question.