Hello Nancy,
Yes...we are currently requiring, for all RFxs, that a mutual NDA be executed and uploaded as a response to a prerequisite - gate/question...in our RFxs. We send a PDF version, pre-signed by us, to the participants in an introduction email a few days prior to publishing the event. In this email we provide an overview of the upcoming event, general Ariba instructions, and a copy of the NDA and inform them they must execute an answer in prerequisites before they gain access to the event. We also provide a copy in the event itself as a reference document. When they upload their response, we have the question set for requires owner approval, so we can make sure they have uploaded a fully executed document before allowing them to proceed.
We are working with our legal to incorporate our NDA into the curren bidders agreement so there will only be a "click" approval....but we aren't quite there yet. This will save us a great deal of additional steps once it is implemented...it is a goal for us to achieve the first half of this year (2013).
Hope this helps!
Happy New Year!
Susan