Abstract
The problem of finding information in on-line technical documentation is addressed by an interactive computer system called Thumb. Users access information free from the strictures of linear text, simple indices, and page numbers. Retrieval is based on a data structure roughly analogous to a detailed table of contents and a heavily cross-referenced index. The model is created and revised by an expert (such as the author) thoroughly familiar with the represented material. The expert's tasks are made easy by supportive utilities. A prototype implementation of Thumb is described and examples of dialogues with the system are given.
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