OSIS brings together many identity-related projects and synchronizes and harmonizes the construction of an interoperable identity layer for the Internet from open-source and commercial parts. Current projects include interoperability work for both Information Card and OpenID implementations.

The OSIS Interops provide an opportunity for implementers to try their code against one another's in a systematic way, providing data to help improve their implementations. The OSIS Interops are not conformance tests. Participants do not "pass" or "fail". There is no requirement that you must support particular features to participate or that you participate in all aspects of the Interop.

OSIS has had 5 major interoperability events.

The OSIS Charter

The OSIS Steward for Identity Commons is John Bradley.