Abstract
In this paper airline ticketing desk operations are studied in order to develop
a greater understanding of numerical workplace knowledge as seen from a
non-essentialist account of mathematical knowledge. In the first part of the
paper alternative approaches to knowledge use are discussed and their
epistemological groundings noted. Next, transcripts are analysed in order to
ascertain the logic of ticket exchange task performance. Methods used for
the study include those derived from linguistic philosophy; decisive use is
also made of the Vygotsky inspired notion of artifact mediation within task
performance. Finally, an attempt is made to find the place of numerical
knowledge within the workplace knowledge of the episodes observed.