  Knowledge Organization Systems (e.g. taxonomies and ontologies) continue to
contribute benefits in the design of information systems by providing a shared
conceptual underpinning for developers, users, and automated systems. However,
the standard mechanisms for the management of KOSs changes are inadequate for
systems built on top of thousands of data sources or with the involvement of
hundreds of individuals. In this work, we review standard sources of change for
KOSs (e.g. institutional shifts; standards cycles; cultural and political;
distribution, etc) and then proceed to catalog new sources of change for KOSs
ranging from massively cooperative development to always-on automated
extraction systems. Finally, we reflect on what this means for the design and
management of KOSs.
