  In manufacturing, many use cases of Industry 4.0 require vendor-neutral and
machine-readable information models to describe, implement and execute resource
functions. Such models have been researched under the terms capabilities and
skills. Standardization of such models is required, but currently not
available. This paper presents a reference model developed jointly by members
of various organizations in a working group of the Plattform Industrie 4.0.
This model covers definitions of most important aspects of capabilities and
skills. It can be seen as a basis for further standardization efforts.
