Thesaurus in user interface - optimum presentation of thesauri

When thesauri are used in online applications, their efficiency can be increased significantly. This requires an appropriate user interface. The designers of data bases are, however, not in the possession of information about neither the use of thesauri nor other authority files at a satisfactory level. Programs created till now support the search only in a poor form, via primitive indices. The aim of the present paper is to give ergonomically suitable and more precise requirements.