Hi Marc Petit-Huguenin , >I read the responses so far, and what can be said today is that there is 2 philosophies, with supporters in both camps. The goal of the IETF is to make the Internet work better, and I do believe that RFC 2119 is one of the fundamental tool to reach this goal, but having two ways to use it does not help this goal. I like the approach, and agree with you that we need a solution in IETF which still is not solved or ignored by participants fo some reasons. However, I agree of a survey or an experiment what ever we call it, that makes IETF reflects to the RFC2119 performance on the end-user of such product implementation of RFC protocols. I think many old participants already have good experience to inform us of some reality of IETF standards' end-user production. AB