The hybrid character of the MOA environment presents otherserial maintenance challenges for the library. A library might con-tain parts of the same journal in print and microform, provideaccess to a part of the journal’s back file through an open-accessarchive, and provide access to issues through an aggregator. Ac-cess for a particular resource may undergo constant change aslicense agreements are renegotiated, embargoes are put into effect,and publication strategies evolve. Keeping up with this constantchange, while making all these variations in access transparent tothe patron, is an additional maintenance challenge for the library.