  Standardisation is an important component in the maturation of any field of
technology. It contributes to the formation of a recognisable identity and
enables interactions with a wider community. This article reviews past and
current standardisation initiatives in the field of Open Source Hardware (OSH).
While early initiatives focused on aspects such as licencing, intellectual
property and documentation formats, recent efforts extend to ways for users to
exercise their rights under open licences and to keep OSH projects discoverable
and accessible online. We specifically introduce two standards that are
currently being released and call for early users and contributors, the DIN
SPEC 3105 and the Open Know How Manifest Specification. Finally, we reflect on
challenges around standardisation in the community and relevant areas for
future development such as an open tool chain, modularity and hardware specific
interface standards.
