IOI vs Quote Message

Imported from previous forum

[ original email was from Ryan Pierce - rpierce@taltrade.com ]
One issue which came up at the FIX meeting in the Q&A period for the ECNs and Exchanges presentation was that we should define when it’s appropriate to send an IOI, and when it’s appropriate to send a book update, be it a Quote or a new message type.

So what do you all think?