The bottom left corner gives bibliographical information associated with this abstract. In the top right hand corner, the system displays the keywords it considers appropriate for this abstract. The indexer can confirm or deselect suggested keywords. For example, plastic has already been confirmed by the indexer as a good hit. Indexers can also add new keywords which they think are appropriate.
Indexers can also use the thesaurus to find appropriate words more quickly.
Together this set of facts, called diagnostic units, constitute the document's representation. Then the identified diagnostic units are compared to a list of correspondences between diagnostic units and document keywords, observed in a training corpus. These are used to suggest descriptors for the human indexer. When the human indexer clicks on that particular keyword, all occurrences of flow and polymer will be underlined in the text. Obviously, training is the key to the system's success.