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"It is interesting that Summon is built using an open-source product architecture - and ditching the need for a federated search back-end is quite a radical step forward into the cloud. I'm wondering if this is related to their different approach to authentication: both Summon and Metalib seem to be 'authentication agnostic' and could work with a variety of authentication systems: but ExLibris seems to prefer the 'up-front' password challenge as opposed to Serials Solutions who give you it the other way round: metadata first and only authenticate later. Is it harder to integrate authentication, as opposed to searching for content, into an institutional login this way round? I don't yet know as I think it depends what choices we make on identity management. Personally I'm drawn to the 'up-front' approach - even though the simplicity of what Serials Solutions are doing is very attractive, I prefer my password challenges at the beginning - rather than at the end of the process. What about others?"