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Bernd Nordhausen

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Publications by Bernd Nordhausen (bibliography)

1991

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Chignell, Mark, Nordhausen, Bernd, Valdez, J. Felix and Waterworth, John A. (1991): The HEFTI Model of Text to Hypertext Conversion. In Hypermedia, 3 (1991) pp. 187-205.

“Manual authoring is a major bottleneck in the more widespread use of hypertext. The authoring process has been shown to be slow and labour intensive and hence expensive. Yet there already exists a large body of printed material which can be adopted for hypertext and hypermedia. In the project HEFTI (Hypertext Extraction From Text Incrementally), we are exploring methods of convening printed text into hypertext. We have developed a model which breaks the conversion process into a sequence of six modular components. The output of the conversion process are hypertext documents in a general specification language. In this paper we detail the model and our implementation of the HEFTI model. We believe the system demonstrates the validity of the model as it was used to convert a medium-sized technical textbook into hypertext within a (long) working day. We furthermore discuss two usability experiments that we carried out on HEFTI produced documents. In the conclusion of this paper we look at some open research issues.”

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Nordhausen, Bernd, Chignell, Mark and Waterworth, John A. (1991): The Missing Link? Comparison of Manual and Automated Linking in Hypertext Engineering. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 310-314.

“Most discussions of hypertext usability are not founded in empirical measurement but more on conjectures based on personal experience. In this paper we report on two empirical analyses of hypertext usability, focusing on the quality of links produced by different means. We conducted two experiments to test the predicted relevance and the evaluated relevance of links, that is, where links are evaluated either before or after they are traversed. In order to evaluate these two kinds of relevance, we conducted two experiments where a hypertext document was created from a printed text. In each experiment we compared the relevances of three different sets of links. One set was created by a human author, whereas the second set was created automatically using the HEFTI (Hypertext Extraction From Text Incrementally) model for converting text into hypertext. We also generated a third set of links by assigning links randomly between nodes. The main goal of this research was to develop empirical tests that evaluate the usability of hypertext links. A second goal was to test the validity of automatically generated links using the HEFTI model. In this paper we detail the two experiments, and discuss their implication for methods of hypertext usability assessment and design.”

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