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Changes in the amount of use and the nature of use of the public catalogue of a large research library following the introduction of online subject searching capability are described in A Study of Impact of Technological Change in Library Service Facilities by Ben‐Ami Lipetz and Peter J. Paulson. Users and their behaviour were studied by identical observational methods before the installation of an online subject catalogue and for an extensive period after the installation, so that the impact could be detected and measured and so that the permanence of observed changes could be assessed. The research was carried out at the New York State Library.