In effect the negative operators used in problem names, but previously absent from Section VD, necessitated repeating the procedure for encoding value words from the original theasaurus. The requirement that every problem name have an explicit negative operator, present in Section VD, was not pursued rigidly. It was used as a guideline to raise questions about the adequacy of problem names. In many cases the negatives are implicit rather than explicit, notably in the case of specific diseases. From this perspective, the negative operator would tend to be present in broader problems to which such specific problems were hierarchically related.
Many problems also have alternative common or shorthand names which lack any explicit negative.
It is important to recognize that in registering problems under names widely used by the international community and in the media, it is necessary to take account of grammatical forms and usage which are not necessarily of the clearest kind, however fashionable they may be. The English language allows considerable freedom for even the most official bodies to employ dubious grammatical forms. It seems important to respect the rich variety of such terms in the effort to capture the values such words are seemingly being used to carry. At a later stage it may be appropriate to move towards a higher degree of standardization of value terminology. Values cited in descriptions of human development Just as the entries on world problems were useful as a means of enriching negative value words, the descriptive texts of the human development entries in Section H were used to detect both positive and negative value words.