The National Information Standards Organization (NISO) has released ESPReSSO: Establishing Suggested Practices Regarding Single Sign-On.
Here's an excerpt from the press release:
Currently a hybrid environment of authentication practices exists, including older methods of userid/password, IP authentication, and/or proxy servers along with newer federated authentication protocols such as Athens and Shibboleth. The ESPReSSO recommended practice identifies changes that can be made immediately to improve the authentication experience for the user, even in a hybrid situation, while encouraging both publishers/service providers and libraries to transition to the newer Security Assertion Markup Language (SAML)-based authentication, such as Shibboleth.
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