  Facility management, which concerns the administration, operations, and
mainte-nance of buildings, is a sector undergoing significant changes while
becoming digitalized and data driven. In facility management sector, companies
seek to ex-tract value from data about their buildings. As a consequence,
craftsmen, such as janitors, are becoming involved in data curation. Data
curation refers to activities related to cleaning, assembling, setting up, and
stewarding data to make them fit existing templates. Craftsmen in facility
management, despite holding a pivotal role for successful data curation in the
domain, are understudied and disregarded. To remedy this, our holistic case
study investigates how janitors' data curation practices shape the data being
produced in three facility management organiza-tions. Our findings illustrate
the unfortunate that janitors are treated more like a sensor than a human data
curator. This treatment makes them less engaged in data curation, and hence do
not engage in a much necessary correction of essential fa-cility data. We apply
the conceptual lens of invisible work - work that blends into the background
and is taken for granted - to explain why this happens and how data comes to
be. The findings also confirm the usefulness of a previously pro-posed
analytical framework by using it to interpret data curation practices within
facility management. The paper contributes to practitioners by proposing
training and education in data curation.
