What is the desirability and usefulness of different thesaurus displays used either singly or in groups? Is an alphabetical listing of terms with cross references more useful to an indexer than a complete hierarchical display? Is the permuted or the rotated term index more useful to the indexer or retriever? Is an alphabetical display along with a permuted display of more use than an alphabetical display and hierarchical display? These are some of the questions raised and, at least, partially answered. The thesaurus display techniques described include the kinds for: (1) hierarchy, (2) categorization, (3) permutation and (4) semantic and syntactic relationships. Some intuitive discussion is given on displays which appear to be of more utility to the indexer or the retriever. However, no actual tests of indexers using the same thesaurus in different displays, or studies of how indexers might supplement one display with another were attempted. There is a brief discussion of the impact of the computer especially the assistance the computer offers to file update and maintenance and the impact of on-line terminals for display. (NH)