Procurement and an Open Source ILS

There was some discussion on the Koha Mailing List recently about how to go about procuring an open source ILS...or at least, how to remain open to the possibility of moving to either an open source or proprietary ILS.  The thing about the traditional procurement process is that it makes if very awkward (at best) to unmanageable (at worst) for the open source service providers for two reasons: