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1 Introduction

The promise of hypertext lies in its ability to produce complex, richly connected and cross-referenced bodies of information. However, it can also become a complex system of tangled webs, confusing both authors and readers. According to Conklin, “disorientation and cognitive overhead are the two most challenging problems related to hypertext”. He feels that these two problems “may ultimately limit the usefulness of hypertext.” [Conklin, 1987].