Two years of impact assessments

This paper has been updated from the article ‘The use of an impact survey as a measure of special library performance’, which appeared in the ‘Proceedings of the 3rd Northumbria International Conference on Performance Measurement in Libraries and Information Services 1999’. It describes an electronic survey of authors at a major research agency, and presents an analysis of their assessments of the impact a special library‘s services has on their ability to carry out and report on scientific research.