This article (thanks Jon) - Patterns and inconsistencies in collaborative tagging systems - is broadly supportive of the value of informal tagging systems when compared to formal indexing systems. There should be some interest later this year in the quality of indexing of medical records. The argument is already about the training and number of indexers. But at least one person has pointed out that despite huge investment the definition of terms remains uncertain. I know from the anonymised data in the primary care QMAS system that the indexing of even fairly clear conditions such as heart failure is so varied as to render indexing of doubtful value.

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