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The notion of pseudoscience, as coined by philosopher Karl Popper, is discussed in the context of its application to library science and its implications for selection. Popper' s demarcation criterion is described. The literature on pseudoscience and libraries, which accepts Popper' s demarcation criteria, is summarized and critiqued. The received view of a rigid distinction between pseudoscience and science is found wanting. The new sociology of scientific knowledge and constructivism is described and advocated as an alternative to the received view of science, and the notion of `boundary work' is suggested as an alternative to demarcation. It is concluded that constructivism is a non-elitist, democratic, and client-centered guide to selection. [ABSTRACT FROM AUTHOR]